302 Had that DZ code in 1969. In 1967 it was a small journal MO or MP code. In 1968 it was a large journal MO code. So keep your eyes open for the codes also. Great video.
@georgehill7881
5 ай бұрын
A 1969 Z28 302, with a set of headers probably made over 400 HP ; but the sound of that little motor winding out to 7,500 RPM was pure music, that was guaranteed to put a huge smile on your face !!! 😮😊😊
@69ssrscam
2 жыл бұрын
1967 blocks (3892657) were MO or MP coded and small journal. 1968 blocks (3914678) were MO but large journal. Only the 1969s were DZ (3956618 or 3970010). Most of the early cars had the 618s and 0010s were mixed in later in the model run.
@chicanou-turn5056
Жыл бұрын
I seen two DZ marking 68&69 if I’m not mistaken 68 add some small and big journals I’m guessing it was ever left in the dealer that they didn’t sell but large journals for 69👍 but mo & mp are Real 302 sbc some people think if it doesn’t say DZ it’s not real
@hydroy1
Жыл бұрын
@@chicanou-turn5056 By the numbers in 67 the 302 was a small journal block (327 block number) and there were about 6 numbers in 67 for a real 302. That was cut back in 68 to 4 small journal 327 block numbers. As far I I know, all the 69 DZ 302s were large journal cranks with a totally different crank then the 67 or 68. Am I wrong in that thinking?
@chicanou-turn5056
Жыл бұрын
@@hydroy1 you are right majority of the 68 and 69 dz Motors are large journals because it was a 350 / 327 / 302 but there was also small journals that they were making in the factory make 1967 going onto 1968 that were small journals and this is 327 /350/302 probably like the last run of the small journal they got tossed into 1968 and then after that everything went large journal I read about it somewhere also 1967 and I want to say 1968 I might be wrong but there was a 302 mo & mp They were real 302 engine before they put the DZ stamp on it in 1968 at 1969 so early 1967 engines did not have a DZ stamp on them👍 But we’re still real DZ 302 motors
@mikebelcher6692
Жыл бұрын
Got a 68 block only, looks as if top of cylinders are slightly chamfered near top. It has been decked and code is not visible anymore. Anybody got any info on this setup?
@kensalazar5066
Жыл бұрын
All 68 Z28's were " MO"...only 69's were dz with 4 bolt mains...
@victorhauk5973
Жыл бұрын
We built a 302 in the 60’s when I was in high school that ran 10 flat and redlined at 10,000 rpm. Sounded sooooo good.
@timconscciensous3570
Жыл бұрын
People don't comprehend those motors. They would need to experience it.
@welshrarebit9238
11 ай бұрын
Bull crap period ….10.000 rpm
@victorhauk5973
11 ай бұрын
@@welshrarebit9238 yep. 10 grand. 10 flat in the quarter @ 140
@TheLionAndTheLamb777
10 ай бұрын
@@welshrarebit9238 I am going to say that would be some impressive feat considering racing engines such Nextel Cup, F1, Indy, and even sport bikes have piston speeds that are not exceeding 4800 feet per minute and in the extreme upper end exceeding 5000 feet per second. A Chevy 302 has a 3.0 inch stroke and to turn 10,000 RPM it would have to have the piston traveling at 5000 FPS. The maximum safe piston speed is 4500 (with fully forged and balanced rotating assembly using aluminum rods). This engine would also need to have the valve train components to match this RPM. It is possible, but very unlikely.
@keithqueen352
10 ай бұрын
@LionWithTheLamb I knew a man by the name of Tom Knolf who raced a '69 Z-28 in the nhra. He dumped the clutch on the car at 10,000 rpm and shifted at 9500 rpm. I've heard many of these stories.
@craytum6945
Жыл бұрын
Thanks so much for this review. The 302 little mouse that could...has always been my fav.
@mylanmiller9656
2 ай бұрын
A good friend of mine's Dad was into Drag racing back when i was in School back in the 1960's. They were racing a 1940 Willies the engine was a 283 Bores out to 302 way back in 1963! Dragracers used the 302 long before Chevy made the Z/28.
@willymccoy3427
Жыл бұрын
I built one back in the '70s. Started with a '60 Corvette base 283 engine that had a cracked block, used the a block from a '65 327 Chevelle and a set of flat top pistons and the rest was from the 283 except the intake which was an Edelbrock Torker topped with a Holley 600 double pumper. Put it in a '71 Nova and that thing would flat out run until I let a buddy borrow the car while I was working one night and he blew the engine up trying to street race it.
@ericwright6672
Жыл бұрын
Bummer! I took a 265 & bored it out to a stock 283 ,powerpack heads ,11to1 pop ups ,400 camshaft,c3bx intake & 650 doublepumper,double pumper,, LOVE SMALLBLOCKS
@hydroy1
Жыл бұрын
Thats what I been holding back my LAST NOS 283 steel crank for. But today it's hard to find a standard bore 327 block that doesn't have issues. They all need to be sleeved as most are already +.060 over and need boring. 8 sleeves installed are very pricey when you add aline bore, decking, open up the clearances and everything else needed. I just did a stock rebuild on a 67/ 327 for my daily driver and I dumped $6,500.00 in that puppy real quick for a STOCK rebuild as I don't miss a thing on machine work.
@dalesmith561
Жыл бұрын
@@hydroy1 A 350 block will also work.
@CAROLDDISCOVER-1983
Жыл бұрын
@@hydroy1 I've got a 327 actually I've got at least four of them. You might call me the old bones collector when it comes to 327. This 1327 I first start out with talking about. 1965 Chevy Impala that my uncle bought new and he parked out in the late seventies out at the farm. It was a station wagon he's special order. He wanted hurry up and get those groceries. I don't think it has more than eighty thousand original miles. He just got tired of the old car and park it out at our farm. Said here it is. I used the top end of the engine including four-barrel intake on no 327 that I built and this is all back in the 80s. I still got that wagon with everything but the upper end and front seat. well anyway you're right they're usually worn out three times over. I once drove five or six hours each way just to pick up a 327 that was built by an aircraft mechanic/Machinist. He had passed away and the engine has a few miles on it. I'll have to pull it down to see what kind of shape it's in because the sun really did not know. some mothballed it with a 68 327 out of CST pick up. Oklahoma sometimes but very seldom got to run across a 327. Occasionally can find one in a Kansas farm truck but the question is can you get to it fast enough cuz either one of those States or four to six hours just to get to the state line. Oh well for what all that is worth. But I do love talking about 327. They've always been my favorite engine but nowadays an LS engine out of pickup is awfully hard to pass up.
@TheLionAndTheLamb777
10 ай бұрын
@@dalesmith561 Yes, if you either use spacers or special extra thick bearings.
@my31and37
2 жыл бұрын
MO 302 for 1967 Z28 and early 68 Z28s, after which the DZs started..Great little high RPM screamers.
@kensalazar5066
Жыл бұрын
According to the Z28 guru, Jerry MacNeish " all 68 302 Z28 motors were " MO" engines. Only 69',s were DZ
@DR-jo7fg
9 ай бұрын
Bought my z in 1976 for $1900.00, now has 73,000 miles and restoring it, got rid of 2 bolt main MO block for a 4 bolt unit in 1980, been in a heated garage in Colorado for 24 years, started right up, no smoke, now I can put all those new parts on her, has L2210. 12-1/2 compression TRW pistons in it, 1/16” rings!
@rondpert5167
Жыл бұрын
In the early '60s, hot rodders were boring out 283s to 4 inch and also using 327 pistons for performance. The results were called 301s because it was actually 301.59 cubic inches. Chevy decided to call their engine a 302.
@trollbane66
Жыл бұрын
I have a '67 z-28 with the 302. The truth, build it for the sound, not the performance. It is one of the best sounding engines ever made. It really starts pulling around the rpm's you normally expect parts to be flying out of the hood. The parts you need to turn it like it wants to turn don't come cheap, and even the good parts don't hold up long turning 9 grand.
@weseethetruth158
Жыл бұрын
Got one in a nostalgia dragster it really doesn't come alive until 5k rpm but it turns 8800 consistently. You're right though not cheap considering it really needs a solid roller and good billet cam core, along with good valves and springs. Even me building the engine in my shop we had around 9k in parts. But like I said its consistent and it's only had 2 refreshes in 8 years.
@dogchicken
Жыл бұрын
302 runs like a 2 stroke dirt bike and needs to be run through the gears like that to really rip. Soggy on low end but strong from 4000 on up. It will outrun bigger inch longer stroke small blocks like 350/400 that can't spin like a 302, from 6000 to 8000 the 302 spools up quick.
@allenwilliams87
2 жыл бұрын
The 69 DZ motors was a 1178 large journal crank. 67-68 MO, MI 302s was small journal which is the same as a 283. Either way it's a great motor and sound really good.
@bigdon2241
2 жыл бұрын
only the 1967 was small journal in 1968 the ho code 302 got the 327 large journal block
@reevesautomotivefarm9614
Жыл бұрын
Great video by the way. One thing I rarely see covered in these videos If You're Building an engine like a 302 or a 327 and you would like to run a really good modern forged crankshaft or forged pistons the price is substantially more expensive than off-the-shelf 350 parts. There are no longer any off-the-shelf 302 or 327 Pistons. I had to go with diamond and have the Piston pin relocated on an off-the-shelf modified piston at a fair bit higher price. I had personal reasons to go with a 327 for my 69 Nova and almost all new part 440 HP solid roller lifter motor will be in the car soon. Just remember 327 and 302 or a fair bit more expensive. And the same Parts in a 350 or 383 will certainly make more horsepower. But at a significantly lower RPM level
@ndg49
9 ай бұрын
Had a 69 Z/28 in the early 70s which was one powerful car. The engine was strong and Chevy had the low 290HP for one reason... lower insurance rates. It also pushed upwards of 360hp, and after I installed headers and had a performance valve job done with a lot of mods to the upper end, the engine builder estimated it was putting out well over 400HP. I never revved it above 6500 RPMs (the red line) much, but I know it could bounce the 140mph speedo at around 7k. I had a Lakewood bell housing with a clutch setup that took awhile to master just the right combo with a 50 lb flywheel. It had a 3.73:1 posi rear end as I never wanted to use it at the strip. With Koni adjustable shocks, it handled well for the time. That motor sounded fantastic thru the turbo Corvair mufflers.
@jamesshipley4985
Жыл бұрын
I had a 69 Z28, had some work done,cam,headwork, also daily driver with 5:38 rear talk about FUN 🤯🤯😎
@kenwilcome3554
Жыл бұрын
Very cool video, always wanted 1. My buddy has one I rode with him once that thing is nuts.
@SJR_Media_Group
10 ай бұрын
We have been designing several SBC's using 4 inch bores. The 302 uses a 3 inch stroke. By adding or subtracting 1 inch, the same engine becomes a 402 or 202. 302 is over square and 202 is 2x over square. The 402 is square. Looking at a 502, high torque engine which is under square, but 5 inch stroke in SBC is difficult. A 1 inch spacer between heads and block is possible. All use 6 inch rods.
@MrDdaland
Жыл бұрын
My dad had a TON of 327's - owner of the vending company next door would swap out engines @ 50,000 miles no matter what. To top it off, he was running propane Built several 302's "back in the day"
@Bob-gy6ud
Жыл бұрын
The real advantage of the SBC 302 was the high rev screamer. Which is awesome on an oval or road course with long straights but so much is wasted on the street, whereas a 350/383/400+ is much better suited for street when operating at lower rpm’s. The sbc 302 does pair nicely with the power glide though since that transmission comes from the planet Krypton
@cobra02411
Жыл бұрын
Some later 283's could be bored out to a 4" bore and back in the day would be called a 301. Same if you mix a 283/327. This started before the "302" was launched and some people still refer to the homemade 4" bore, 3" stroke engine as a 301. Actual displacement is 301.59 ci. 68/69 had a large journal crank and is specific to the 302. Small journal had a slower bearing speed. Oil has a limit, so higher bearing speeds cause the oil to shear and you lose the cushion. This is a big problem in the 455 Pontiac engine which is why it's better to use a 400 block to build a 455 if you want to rev over 5.5-6k rpm consistently. IMO you can get all the high revving fun out of a 327. Heads and intakes that flow well are available in the reasonable price range. You can make anything rev to the moon, but the 327 is a great platform to do it for a reasonable cost. I'm talking a 7-8k rpm screamer. The bigger the displacement the bigger the heads and intake need to get and the higher the price gets. In 1970 the SCCA dropped the homologation rule for the 5.0L displacement and allowed de-stroking production engines so they stopped.
@timconscciensous3570
Жыл бұрын
You are spot on. So many people don't know this!
@dillonoliver27
Жыл бұрын
Fun fact about the 1969 dz302. The block itself is physically smaller in a sense than a typical gen 1. If you put a 3.48 stroke into it the connecting rods bolt head will hit flat on bottom of oil pan surface. You have to cut 1/2-3/4 Grove for each rod.
@jcchristopher7827
Жыл бұрын
It depends on the serial number theres a few that were known as the 4" bore blocks they used them for all four engines 302 327 350 377 but the performance or racing block they are smaller than the common ones
@kh40yr
7 ай бұрын
The Chevy Vega was going to be the most unique for it's time. It was going to get a all alum GM DZ 302 at 11/1, 4 speed Crusher, Posi rear with 4.10 gears, 4 wheel disk, big swaybars, Was to be called the Z-29 Vega (Z-28 was taken). 1 Prototype was made, don't know where it is now. I remember Blue and white striped scheme, some USA thrown on there I believe. Blond fender candy in sequins and Go-Go boots, Torpedos in place, lmao. The gas crunch hit and emission regs popped up, all our hopes of SERIOUS fun with cool shit were dashed. The 302's were a track car, not so much a street warrior per-say, although, they did earn their black stripes on the street. The loved to sing on the track with the solid lifter and big carb. It WAS a challenge to keep a tank of hot fuel in it. I kept a "Green Book" of all the airports with 100 -110 fuel available. I did find a 1959 thick wall 283 complete untouched unopened(until me) for $300, 50k miles. Steel crank is perfect. It keeps looking at me. Iron Eagles or some worked Twitted Wedge heads.
@flinch622
3 ай бұрын
Nice shirt: maximum approval!
@jackcarriger7200
2 жыл бұрын
Do the 283 next!
@mattv8919
2 жыл бұрын
i second that
@RatMaro
2 жыл бұрын
I'll make sure to put it in my schedule!
@beestoe993
6 ай бұрын
The problem I saw with the 302 is that the 11:1 compression was NOT a problem for pump gas in the late 60's, but it certainly is today. So yes they can be made better today, but part of modern improvements will be just to catch up to loosing out on the benefit of high compression.
@Davidwilson-fq7jf
Жыл бұрын
Used to run 9 seconds quarter mile
@jameshendrickson8159
9 ай бұрын
What id kinda like to know is, what kind of na power and torque that one can squeeze out of a 302 if one were to use modified vortec heads 2.02 valves, etc using also a hyd roller cam with solid roller lifters, and dual quad tunnel ram, but no nitrous or power adders. And modern guts/tech....
@jonminnella4157
6 ай бұрын
I love your program
@chrisrolph6333
Жыл бұрын
They made 602 z/28's in 67,I know because I owned 1 and a dz 302 I put in a stripped out 70 camaro
@KennyFisher-io4dm
3 ай бұрын
I've owned my '67 Z27 for 49 years(350-introduced in Camaro- Camaro exclusive) and drive it almost daily! Also own '68 Cougar, 428 Cobra Jet, which wife's brother bought new in '68! Mercury made 602 big block Cougars too! 244 with the 428 CJ package and 358 with the 427! Love both cars!
@jimmywilkinson9190
2 жыл бұрын
Johnie bought a 67 Camaro with a 302 with slanted spark plugs for 900 dollars that even shined . It was blue with a white strip. It did not run but me and Danny put a timing chain and it started up . The chain did not jump but was stretched badly. We did a comp. test and they were all good . We put a 780 Holley and a rebuilt dist. We could not get it to scream . After we gave up it ran for 7 years and he sold it , so who knows how long it ran .
@Evil-Jesus
2 жыл бұрын
Angle plug heads are aftermarket chevy heads
@DaveR-lo6hq
Жыл бұрын
Score
@Evil-Jesus
Жыл бұрын
@@Jack-jw8eh Never saw a 375hp 350
@markbreitenbach5083
11 ай бұрын
Built an LS 302. Most Wicked Engine I ever built. 10k R.P.M. all day.
@davelewis2174
2 жыл бұрын
the cam had late intake valve closing to use the 11/1 pistions , i put an ls3 in my 69RS Z/28
@thomasbradley7844
8 ай бұрын
You can just use longer rods and shorter pistons to get same results say 3.50 crank with 6.100 rods and still get more torque and high rpms
@tommyshackleford614
2 жыл бұрын
D z 302 also had steel crankshafts
@micahcastillo9113
2 жыл бұрын
All of the cranks used in the 302’s were forged steel. The difference was in the journal sizes. 1967- ‘68 were small journal, but in 1969 the engines were given the new large journal forged cranks.
@tomhanson4153
2 жыл бұрын
@@micahcastillo9113 only 67 were small journal
@rjjen1696
10 ай бұрын
great info --would enjoy building one --the cheaper version anyway
@84C10JEFF
4 ай бұрын
Builda gen 2 LT with the 5.7 and its little brother 4.3L as it has a 3” stroke .
@mrpatrickj1
Жыл бұрын
want to have some high RPM fun build a 400 block with a 3inch stroke and make a 327 the hard way. It revs like a 302 but more inches for torque.
@debi5292
Жыл бұрын
Massey Harris combines in the time period had large journal 327 industrial engines. Great place to look for them is a salvage yard for combines in the farm belt.
@tonybuck5252
9 ай бұрын
Bad ass engine
@jasonstewart8973
Жыл бұрын
This is the time chevy out done ford Dz 302 is a legend
@scottford1091
Жыл бұрын
Not so fast... boss 302 makes more power with less cam and compression. About 25 more... 350 vs 375 on the dyno.
@backyardbuilttrucks1
Жыл бұрын
How about why Chevy with 302 and the 402 3 years each but what else about these two engines .
@Davidwilson-fq7jf
Жыл бұрын
I had one with twin turbos used a avgas 120
@williamgames317
Жыл бұрын
And I'm also trying to sell the Vega with everything that goes with it including fiber glass front end
@jamest.5001
Жыл бұрын
Id like to get a 3" crank in a 400 block, with 6.125" rods possibly 6.200" rods, and light weight pistons, and aluminum heads zero deck, with 58-60 cc heads 2.08-1.55" valves around 220cc runners, around 11:1-11.5:1, tge aluminum heads should allow it on pump gas, maybe mix with 98-100 octane, half and half run about . 585"-.600" lift roller cam, I have the block and heads! 😆
@timconscciensous3570
Жыл бұрын
I can't even imagine what that would do!
@lindseysteele1436
2 ай бұрын
Sounds like it would be one of a kind
@TrentGustus
Жыл бұрын
I raced circle track. We decided to use a large journal 302 because the rules said we would run 10 lbs per cubic inch. Meaning that our 302 would allow us to run a 3020lb car instead of a 3550lb car. You are wrong about the power. We'd reach the speed the 355 would by mid straightaway. We'd come out of the corner at 4500 rpm and end at 7700 rpm. We were the car to beat. Even when we ran tracks with a gear rule, we'd not lose much , they could pull a half a car length down the straightaway but I could fly through the corner much faster being 500 lbs lighter. The 302 is a better motor than the 350 no question.
@lindseysteele1436
2 ай бұрын
Interesting
@tommymelton2470
2 жыл бұрын
I ordered a new '69 Z/28, removed the carb and replaced with '63 Rochester fuel injection. The Z/28 engine was essentially the old Corvette 327 fuelie engine destroked and with carb. It ran better with the F.I. unit, and would turn more rpm. There was also a unique 327 in "66 Novas that was factory rated at 365 hp with a carb.
@thegreenerthemeaner
2 жыл бұрын
That was the L76 from the Corvette. It was a carbureted L84 "Fuelie" engine. The L79 327-350 was the highest hp engine available in the 66 Nova and they were hard to run down because they were so light. 3.31 gears was all they really needed on the street.
@kevette357
Жыл бұрын
Are all 283 cranks forged
@crazyoilfieldmechanic3195
Жыл бұрын
What's sad is that without a standard transmission and a modified rear suspension and drag slicks whatever car that puny small block is in won't do squat and the heavier the car the worse off it will be. Any midsized car with mild big block engine will trounce it.
@kenneth9874
Жыл бұрын
Not always
@williamgames317
Жыл бұрын
I would love to talk to you more about it
@artyberkhoff8878
Жыл бұрын
Not a single part of a ctual 302 was available in any other chevy engine rockers, pushrods, rods, crank and even the blocks where moly iron. What you can build was the popular 301 which is what you are talking about.
@HSTvids357
Жыл бұрын
In 69 they quite literally built them out of the exact same block casting they built 350's with for the decade following that. Every part in it other than the pistons was used in other engines right from gm.
@artyberkhoff8878
Жыл бұрын
@@HSTvids357 do some reasurch other than the internet you might learn something caus you are wrong.
@HSTvids357
Жыл бұрын
Okay lol. Best of luck paying double price for that "010" block because it's a "corvette motor" when it's been decked and the actual information is gone that it came from a pickup truck.
@chicanou-turn5056
Жыл бұрын
So can you put the 302 pistons right in at 3:27 block or do you have to have a board
@eyeshocars9978
Жыл бұрын
Same bore
@jbsmudslide68z33
Жыл бұрын
Just got to change the crankshaft, rods (unless you have a real nice set of floating rods) and the pistons and your good to go.
@chicanou-turn5056
Жыл бұрын
@@jbsmudslide68z33 I no that 283 or 302 crank shaft just wondering on the standard bore if they will just fit right in there of course you’re not gonna find an original set unless you wanna pay top dollar but the new ones could go 30 or 40 over that’s not a real 302 The way this guy says in the video you can just make your own 302 So there has to be a recipe without using original 302 parts because at the end of the day they are a mismatch of a couple of things put into one engine that makes An original factory 302 right
@jbsmudslide68z33
Жыл бұрын
@chicanou-turn5056 I got to agree with you on that. I have found a lot of good deals on 302 Chevy parts. Crankshafts, pistons and even blocks over the years. But I do know what to look for. I been dealing with 302 for years and putting together a 68 302 with factory GM Crossram now.
@johnhegarty1761
Жыл бұрын
67 302's were YZ code 68 & 69 were DZ code.
@jbsmudslide68z33
Жыл бұрын
67 and 68 is MO code.
@donaldseccombe3893
Жыл бұрын
Although a high winding 302 and 4 spd lots of fun
@rogerhankins6905
Жыл бұрын
And rods
@MANSON_333
7 ай бұрын
Dam does this ever stop with the Freemason hand gestures???? 😒
@bradwesterman-wp1kb
8 ай бұрын
They weren't impressive on the streets. More for road racing.
@tedmckinney3944
2 жыл бұрын
67 and 68 were small journal, 69 was large.
@bigdon2241
2 жыл бұрын
nope only 1967 was small journal
@carlinshowalter1806
2 жыл бұрын
@@bigdon2241 Correct,look in the parts catalog for bearings and it shows that's true.
@glenbiliti7076
2 жыл бұрын
@@bigdon2241 62/66 are small journals
@bigdon2241
2 жыл бұрын
@@glenbiliti7076 no small journal last year 1967 in 1968 all large journal
@timconscciensous3570
Жыл бұрын
67 was small 68 and 9 were large
@joe-hp4nk
Жыл бұрын
The Boss302 spanked the DZ302
@timconscciensous3570
Жыл бұрын
Dilusional! The chevy 302 won the trans am race two years in a row!
@robertfancher763
Жыл бұрын
I had one. Great engine. Had 12.5 domed pistons,202fueler heads,solid lift cam. Balanced reved to 9500 rpm. Raced it. Fantastic engine.
@northface484
Жыл бұрын
Bullshit...
@timconscciensous3570
Жыл бұрын
You were a lucky man!
@jayweckerle5498
2 жыл бұрын
Get a late 80's roller 350 block and add a 1994 L99 3 inch stroke crank. I used 6.25 inch rods and 350 pistons designed for 6.00 inch rods. This thing with a mini ram and 276 duration cam made 400 HP on the tires and ran with the AC on. Have fun
@ryandaly9831
Жыл бұрын
What kind of heads did you use? I bet with the Vortec heads that would be a mean little engine! What kind of RPM you pull out of it?
@chucksmith1145
Жыл бұрын
Yes !!
@chrisbraswell8864
Жыл бұрын
I built a small block 327 in 71 with 11.25 pistons and a Dontov 30-30 cam in a 55 Chevrolet ,Edelbrock 2 x 4 with 2 x 600 carters, it would rev past 7000 rpm and tote the front wheels for about 3 car lengths. Broke the motor mounts on the Bellhousing continuously. Put solid steel ones on and stopped that. I was really impressed with that Engine. Clacked like it was coming apart at idle if you can call 1100 rpm a idle but would snap to a really loud roar very quickly. Ported the heads to a round tube Mikey Thompson headers, Had two Edelbrock oval mufflers, it deformed the back of them. Ran good with mufflers but really ran with mufflers off. The good old days.
@thomaslemon3971
8 ай бұрын
Awesome story man. It’s ones like this, that only make my hot rod fever worse lol. Hope you can have another badass street machine someday soon!
@jchavins
Жыл бұрын
Hotrodders were building 302's long before Chevy brought out the Z28 302. Yu left out one of the most important parts about building a 302 and that is the choice of heads. For te street the early fuelie heads (1.97" intakes as I remember) are a great choice. My personal favorite SB though was the 350hp 327 found in the 66 Chevy II SS......
@jamesgiddings260
3 ай бұрын
We generally called them 301s though. (301.6 actual displacement).
@8092DJ
2 ай бұрын
@@jamesgiddings260generally?
@Mike44460
Жыл бұрын
I had a 1969 Z. The very best performance add-on was a 4.88 gear. Talk about a red light bandit, color me gone.
@georgehill7881
Жыл бұрын
I also had a 1969 Z28 - and eventually I went with 4:56's ; as for acceleration, it was way under-geared from the factory.. With the stock 3:73, it had a top speed of about 150 MPH !!! But putting on a set of headers was essential, for the little, screaming 302, to perform to it's full potential !
@allanredlin2821
2 жыл бұрын
Guys racing modifieds were building 302's long before the Z28 came out.
@hmitchell3488
2 жыл бұрын
Yep. Yep! .125 overbored 283 yielded a 4.000" bore coupled with the 3.000" stroke for 301.5936 vs starting with 4.000" bore block and aforementioned 3.000" crank for 301.5936 ci aka 302. Bavk in the day Chevy's Vince Piggins copied the old hot rodder's go-to engine combo from existing parts 327 small journal block and big valve 2.02 /1.60 heads and powerpak 283 crank and BAMM! High revving, good breathing screamer for the original 699 or so 1967 Z/28 homologation cars.
@jaxsonwarren7497
Жыл бұрын
yes we called them 301
@stevenbelue5496
Жыл бұрын
There was only certain 283 blocks that could be bored that much, I can't remember what to look for but there was something in the timing cover area that gave it away. I think they used the same 327 tooling. I had one and it ended up at the scrap yard.
@allanredlin2821
Жыл бұрын
@@stevenbelue5496 the 1957 was the block
@michaelzalewski1462
2 жыл бұрын
I'm building one with a vortec 350 roller block and a 4.3l v8 crank, both of which I have
@williamcarey6592
Жыл бұрын
Built a repro 302 50 years ago. Used a 59 Corvette 283 punched out to 4”. The block would take the overbore, I used flat top pistons Fulie heads etc. Ran it in a 39 Ford with 4.11s it weighed 2980 and ran like hell. Used and abused it for over a decade. Still have the car now 350ci
@BigdaddyC4
Жыл бұрын
My dad's set up in his 72 vega wagon gt 2300, was a 327 60 over 202 heads solid lift cam 283 crank 4:11 gears on a 10 bolt with ladder bars went from the m22 rock crusher to a 350 3200 stall.. because he missed a gear and lost for the first time.. just Reminiscing l o l
@FreeXenuProject
Жыл бұрын
I think you did an excellent job with this video you had a lot of information that not many people understand. I did want to mention people that talk about getting 9000 + RPMs are not talking about the painstaking effort going into Blueprinting the engine, Making sure every piston, every connecting rod and all the components not only measuring as close to exact sizes but weight the same is key along with the small Journal blocks in allowing for such high rev speeds safely without causing engines to blow before their time.
@geraldtodd4667
Жыл бұрын
67 302's did not have the dz code.....do your research.....but the internet lies.....
@craigcampbell6690
Жыл бұрын
302..513 gears ,Low 10's 🙂
@scottford1091
Жыл бұрын
Lol
@genehart261
2 жыл бұрын
It was a smokin' radical little engine! Almost unknown 'cause of a "competitors" 302. Almost too high strung for the street.
@jaxsonwarren7497
Жыл бұрын
you are telling how to build a 302 from a327 which is true but you forgot to mention that you have to use 302 pistons due to different wrist pin height
@jcreed123
Жыл бұрын
i made one for my 69 camaro (not a z/28) a few years ago. i used a 283 forged crank and its original block. i bored it to 4 inch. you have to take out a lot of iron but it works fine.
@carlinshowalter1806
2 жыл бұрын
I have a '67 302 block with the correct casting numbers that I bought from a guy that didn't know what he had. But I can't deal with the 11:1 compression pistons that cost $600 to $900 a set depending who you buy them from.I've bought three 283 short blocks at the salvage yard and they all had cast cranks so I'm giving up and gonna sell it to someone with a real Z that wants the correct number block and buy a 350 to put in my Camaro. 350 parts are super cheap.
@tomstulc9143
2 жыл бұрын
Really isn't anything wrong with the cast crank if it's in good shape. Set of flat top pistons depending on which cylinder head you use. should keep you in the 10 to one area for compression. you can run on pump gas all day on that. Around Ran my 68 GTO at 10 1/2 on pump fuel for years. (Pre ethanol) era of course I live at 4,000 ft above sea level and usually uphill went uphill sometimes to 7000 and higher elevation. So have modestly reduced compression ratio due to atmospheric pressure.
@thegreenerthemeaner
2 жыл бұрын
If you just have to, find a 283 from a truck for a forged crank. Look at the parting line on the flywheel end of the crank eith the glywherl off. If it's narrow and sharp, it's cast. Wide and flat, it's forged.
@Youralwayswhining4367
Жыл бұрын
If you haven't sold it yet what are you wanting for the 302?
@timconscciensous3570
Жыл бұрын
I would be interestedvl in buying what you have.
@georgepaust8416
Жыл бұрын
Okay let me spell this out for you because there were many misnomers to be corrected. Quite simply, the 1967 and 1968 Z28 engines were two bolt main cap 327 blocks with 283 crankshafts. The DZ 302 you are referring to was a one-year-only engine in 1969. They cast a new four bolt main block with larger main journals, produced a new crankshaft of forged steel with larger rod journals to accept the new heavier duty connecting rods. The next year they would add a steel crank with a 3.5 inch stroke and would dub it the LT1 350 which went into the 1970 Z28. Okay?
@DaveR-lo6hq
Жыл бұрын
I actually gave away the mo 2 bolt block for a 70 CRE 300hp 350 4 bolt block out of a monte and put all the guts in it should have kept it but I was single in the Navy and in Washington state with no storage room
@DaveR-lo6hq
Жыл бұрын
68 was large journal, no 283 crank - it was specially made for the 302
@jeffweaver6395
Жыл бұрын
Very correct. Dz was completely original 1 year only
@timconscciensous3570
Жыл бұрын
You learn something new everyday. Thank you.
@Dogboy1960
3 ай бұрын
You could build one......but you have to ask. Why would you? There is a lot of near ROMANCE for the Iconic little Racer that was the 302! That's a fact. Why? TRANS AM!!! The engine powered Mark Donahue to some high profile Championships in his '68 and '69 seasons before Chevrolet pulled out and Donahue left to run an AMC instead. So this alone certainly explains the popularity and ICON status that lives on to this day. In 1967 when Chevy had to build an engine to meet the rule requirements their 327 and new 350 engines already had the 4.0 inch bore and that old school 283 crank length gave them the dimensions required. Engineers threw every trick and part they knew to do at the time at the engine. Free floating wrist pins, all forged low end parts and the best factory heads of the day. Solid lifter cam and pieces like the dual carb cross ram were developed. All of this for use in a racing series that limited entrants to 305cu in or smaller. As a street car motor or drag race engine. This is an IMPOSSIBLE engine to want between the fenders of a Camaro. I can't think of single way to go that makes the 302 a "winner" vs easier and less expensive builds to get to any given ET you might be targeting. The 302 was never installed in any other car beyond the Z/28 for a good reason. It wasn't a good engine vs what could be built when you weren't facing that Trans Am rule book. Today it's really tough to build one. I'd only do it for a factory correct piece of Chevy History. A GOOD '67-'69 real Z/28 Camaro is the only car I'd ever build the engine for and I'd be doing with a clear understanding of how much power I'm giving up after spending the cash and effort vs what I could have built out of a SBC without a 302cu in limitation. Small wonder to me 383 sizes are far more common today when talking about a small block with a 4.0" bore. It takes a pretty serious racing build to coax 500 very peaky HP out a peanut sized 302. You might not care if it makes lousy power under 4,500RPM at a race track. Yet street going, mild mannered, 383 sized engines doing it with big fat torque curves means you can have your cake and eat it too. You can make the same top end power at lower RPM and retain a bunch of tire sheading torque down where you can really use it on the street. Even at the drag strip..... a 383 with a 2,500-3,000RPM stall or clutch dump off the line is going be a lot easier to make reliable than the 302 SCREAMER that winds out to super high RPM and needs a super VIOLENT 4,500 or higher converter or clutch dump to get out off the line. In this you find good arguments for why you so rarely see small displacement SBC. 350 is new "small displacement". I'm seeing a lot of 400 and even 427 Small blocks these days. Roller Cams and aluminum heads with so much more flow than was available back in the day is big part of why the trend to far bigger displacement is happening.
@jamesgiddings260
3 ай бұрын
Correct! In '70 SCCA allowed destroking, hence the introduction of the LT-1 350 in the '70-1/2 model Z-28.
@TrentGustus
Ай бұрын
The 302 was definitely the goto around racing rule books, but you had to use the rpm to make it work.. with modest parts it could rev 8000 rpm and be reliable.. where the 350 could not. Side by side, a 302 at 4500rpm could out accelerate a 350 at 3500 rpm on a race track. I raced a 302 on the ovals against the 350.. we selected the 302 on purpose.. for these reasons. Solid lift cam, 11.5:1 compression, heavy valve springs to run up to 8000 rpm.
@timconscciensous3570
Жыл бұрын
I had the privilege of having a 302 with 292 heads solid lift cam 11to 1 compression. My god what a screamer. It was in a 57 bel air manual transmission. I'd kill to have it back!
@kylemilligan752
Ай бұрын
Building a SBC 302 today is pointless. There are no arguments that are logical. Put all of your dz302 parts in a 350/383/400, it just makes more hp/tq.. Again, take your "correct" dz302 parts, bolt them on a 400 SBC. the 400 will win every race you can imagine
@markostrem1248
2 жыл бұрын
1968 Z-28 motor does not say D.Z. ,they actually say M. O. instead. But in 1969 they say D.Z. on the front of the block,and the crankshaft from the factory!
@palanskisimmons
Жыл бұрын
I Have 1 in A 1981 Cutlass Supreme
@roywolfe7054
Жыл бұрын
Building a 327 with a steel crank with vortec heads and intake full roller set up😁
@ljbrizo
Жыл бұрын
THE COMMENT ABOUT THE 350 BEING THE KING OF THE SMALL BLOCKS IS HORSE SHID, IN THE 70 s ans 80 s WE RAN SMALL JOURNAL 327s WITH T 400 WITH 3:90 REAR END COMBOS .STREET DRAG RACING FOR YEARS. NEVER NEVER WAS BEAT BUY A 350 CHEVY IN ANYTHING ,
@scottford1091
Жыл бұрын
I never got beat by a 350 either for that matter, any chevy on the street. 351 Cleveland in a 66 mustang gave the Chevy boys fits....
@timconscciensous3570
Жыл бұрын
I would have to agree. People just don't know.
@crazyidiot5309
5 ай бұрын
I have a cam'd 302 my dad gave be from his old Chevelle. He moved it into his old Custom Deluxe and had his blood sugar been stable at the time he wouldn't have smashed the side of it into a tree. Engine is in fine condition and I've been babying it for a project. What would you put it into, modern/semi-modern?
@MattsMadnessOfficial
Жыл бұрын
I have a couple of 302's one I built one stock, they don't rev because of the short stroke, if that was true the ford 302 would rev like the chevy 302 :)
@georgehill7881
Жыл бұрын
I believe the biggest difference between the Ford and Chev 302 Engines, is in the profile of the cams !
@MattsMadnessOfficial
Жыл бұрын
@@georgehill7881 cam profile, compression ratio crank weight rod/ piston weight , bunch of things different and the chevy 302 don't split in half
@timconscciensous3570
Жыл бұрын
Ford 302s are pure shit! Good boat anchor!
@pappy451
10 ай бұрын
" back in the day . . . " you used to be able to buy high octane fuel at the pump . by " high octane ' i mean over 102/104 ? something like that . also , you could always go to the local airstrip and buy aviation fuel . . . at least , around here you could . if you could afford it at about double the pump price of premium . yes those were the days . . . my friend .
@tjtrantham8192
6 ай бұрын
Ive got at a 69 dz block and piston but no crank and ive got 4 sets of the fuelie heads they called them replacement heads i would like to sale it but not the heads it took me a yr to figure out what the DZ stood for until
@dish125db
Жыл бұрын
11.1 will run on pump you just need an in cab ignition adjuster or efi
@bryongreenwell7351
2 жыл бұрын
My 1968 Z28 302 put out 350 hp
@yorotirb3941
Жыл бұрын
Aha! So thats what i heard yrs ago and wondered what he had in there. It sounded more like some high powered sewing machine, LOL!
@milwaukeegregg
Жыл бұрын
Had one in 69. Without gears its a joke. You have to be 4000rpms to get a smile.....
@zeppelintreeog4574
8 ай бұрын
But what if you bore it .30 over and keep the same crank essentially making a 306?
@jimmorris8051
Жыл бұрын
You keep saying "share the same casting number". Is it forged or is it cast? Which is it?
@kennydswartz
Жыл бұрын
Are these the same as the gm302's that cam out of the M211 military trucks?
@Spudderr
Жыл бұрын
3 inch stroke small blocks are a ton of fun on the street
@brucegillies1694
Ай бұрын
Make mine good heads and cam , intake but 327 !
@richarddawdy8488
2 ай бұрын
They were also found in the SS Nova.
@jamesmartin6608
6 ай бұрын
I might be a small block Chevy 302
@DennisMurphey
5 ай бұрын
Yes I had a 302 briefly in my 64 Corvette. I sold the 327 365 HP for a 396 375 HP which blew up. And i tried several Rats that failed. A friend had a Hot 302 from St Louis and let me run for a few months. It was as good or better than the 327 365 HP. As you point out, same cam. Duntov 30 30. I sure miss those engines and times. I will like to build a hobby car with a strong mouse but your 5.3 LS has me thinking. Great video. Thanks D
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