I tried the higher flow water pump and it actually made things worse, and when I spoke to Griffin Radiator techs, they advised that you actually want the slower water flow through the radiator as it gives more time to cool. After i did that, my cooling actually got better. Increasing the size of the water passages probably is a good idea. I'm glad I came across this site as I've always been concerned about my water temps on my 500's in this Houston heat. I always got nervous when it went over 200, even with this super large custom Griffin radiator.
@mondre1vanderlee36
24 күн бұрын
I have the 472 in a 59 Apache and put the Flow Kooler water pump in, put in a new thermostat & drilled the 3/16th holes and did the chrome thermostat neck conversion. It has an aluminum radiator and two large electric fans. Runs between 203 and 208 in 100 degree outside temps in Arizona. I'm pretty happy with that since 215 to 220 is normal as you stated. Thank you
@lucyweidner3493
12 күн бұрын
Thanks for the tips to inhance cooling. I just finished drilling out the three holes on both banks of the block. FWIW, the small holes were centered in the cooling passage area on the block, so there was not enough room on either side of the existing 1/4" hole to put another 3/8" hole, so I drilled the second hole in the block depression and angled it toward the cylinder. The new hole broke through right next to the first hole. Worked out perfect. I'm hoping this along with other tips will help keep temps down driving my 12K lb Motorhome in hot weather. 🙂
@scotteric8711
Жыл бұрын
Great point on the heater outlet Scott. GM cheaped out by knocking out a head plug and put the outlet there thinking they would solve the hot rear cylinder issues. The problem is the same as if you install a high flow water pump..The coolant is not present long enough to absorb the heat and do its job. I drilled & tapped my late blocks for the early outlet because I liked the heater hose better that way myself. That and Stainless performance makes a nice one that fits these engines perfectly.
@kenmey1516
5 ай бұрын
Cool. I never Took my 1976 apart yet to see what you're talking about. But I can see the water outlet at the back side of the head on the passenger side. Thanks for the info.
@LynxStarAuto
Жыл бұрын
My dad used to install higher capacity radiators in these things, with a cooler stat and he used to bypass the heaters as we live in South Florida. Always remember these engines running under 200 with those upgrades.
@briansipe9755
Ай бұрын
Always informative and well researched and Explained very well. Thank you Scott
@pmd7771969
Жыл бұрын
We raced these back in the 80s. We opened the holes and removed the t s. Bv
@robertgooden2346
10 ай бұрын
I have a 472 -1972 Deville with less than 40,000 miles. I'm sorry, I just found your channel, but I'm a Subscriber now, really great content. THANKS
@AlexM-tx2vr
Жыл бұрын
Scott, thanks for the great tip. I wish I saw this video before I assembled my motor.
@ladon50la
2 ай бұрын
Scott I have a 1970 coupe Deville and the heater core boss is just below the thermostat does that ripple screw out so that I can plug it. To delete the heater core I changed the Radiator and installed the high flow Thermostat. And will deleting the heater core cause the engine to run hot?
@robertkollasch2473
Жыл бұрын
This is great observation, thank you for publishing this video
@richmond4471
10 ай бұрын
Thanks. I always wondered why these engines seemed so prone to overheat.
@ImpalamansGarage
Жыл бұрын
Great tip on the thermostat!
@pjmccoy4216
Жыл бұрын
Thank you for this video. Your videos have helped me so much.
@rustybumperclassics6342
3 ай бұрын
Good video
@kenmey1516
5 ай бұрын
At the end your talking about the water temp- gauge the sending unit being to long I had that trouble also. Funny I did what you did and I had same trouble with a ford motor and had to do the same thing . These motors weren't to be messed with by anyone but the first person to put it together it seems. After that what ever happen is no big deal to the engineer how thought up all this on paper
@warrenlucier5796
Жыл бұрын
I'm under the impression that the aftermarket aluminum heads will also aid in heat dispersion, to a positive effect beyond other design improvements intended.
@scotthatch4548
Жыл бұрын
They will pickup more heat and increase water temperature while reducing the combustion chamber temperature ... Normally to make the same power with the same head but in aluminum you need to add one point of compression ... You also usually need to increase cooling system size a bit
@patrickwendling6759
Жыл бұрын
Thank you for your knowledge 💪🏽
@gmcnelly2468
Жыл бұрын
good video.
@Yhung4Kash
Жыл бұрын
will you do a video on the vacuum lines and how that affects timing or what lines are needed such as the vacuum of a th400 to the top of a 472/500 it just needs to be to the intake I believe.
@trailerparkcryptoking5213
Жыл бұрын
Great content! Useful info! My daughter’s ‘68 will slowly creep up in temperature while sitting still at an idle during hot Texas summers, but as soon as you start moving it cools back down. I need to check and be sure it has some vacuum advance for starters, but it looks like the six blade fan is kind of small for a big engine and I wonder if it’s the correct fan? Also wonder if the fan clutch works properly, is there a way to test or just simply replace it? I have the intake off for new gaskets and after watching this video I should check the thermostat and possibly install the high flow version as you suggest and drill them holes..... Thanks for sharing your expertise!
@scotteric8711
Жыл бұрын
I can't speak for other models, as my 76 doesn't have a thermal vacuum switch, but my '69 engine did. GM engineers purposely made them run hotter to help better atomize fuel. They did that by heating the carburetor base at the manifold. Obviously it helps with anti-ice in the cold months. You can easily prove this by adding a spacer, (Mr Gasket phenolic & wood works great IMO) and on a stock engine will run terrible, falls on its face. What GM dealerships did was use a gasket to block off the passages under the carb shim to remedy cars in hot climates with run-on issues. OR an adjustable vacuum advance was added. The Thermal vacuum switch would retard the timing if the engine got too hot to cool the combustion. (Now we use EGR and add vapor to do this) but in theory it worked because a carb did not pull out fuel as does modern injection fuel trims, so it pulled timing instead. This confirms the authors theory on later cams having built in retard. '68-69 were the "hottest" engines and still the best running out of all I've ran. If you find a unmolested '70 500, let me know how it stacks up. I ran my '69 with leaded 110 in HS back in 2007. That car loved it and never over heated.
@eldlife2129
Жыл бұрын
Hi. I enjoy to watch your channel everytime. please tell me where can I get this thermostat? my thermostat can't block off bypass hole.
@scotthatch4548
Жыл бұрын
Regular parts store should have one ....but if you are having trouble finding one there is always Cad Co / flashcraft in Albuquerque New Mexico
@eldlife2129
Жыл бұрын
@@scotthatch4548 Thank you Scott. I looked it on cad co now but it’s out of stock😢 If you don’t mind please tell me a parts number & brand you got .
@Akasnacker
Жыл бұрын
Hi I've been in communication with you for my Eldorado thank you very much! I was wondering there's a range of 160°, 180° and 195°, which degree thermostat would you recommend I'm thinking 180 because I think 160 might be too cool what are your thoughts? 🚗
@Akasnacker
Жыл бұрын
I have a 1976 Cadillac Eldorado with a 500-in motor and I'm having all kinds of problems with it overheating I got the car used it doesn't even have 30,000 miles on it I want to change out the thermostat and flush the system I'm going to start there I wanted to ask you what thermostat temperature range should I buy the 195 or the 180 in your video which ones better for quicker cooling cuz it seems to be starved from coolant from what you're describing in the video thank you.
@scotthatch4548
Жыл бұрын
Once the thermostat is open it doesn't matter .. thermostat sets min temperature not maximum temperature ... Make sure it's a Cadillac thermostat and factory temperature would be 195 degrees ... Not sure what you are calling hot but engine was designed to run 210 to 220 ... If you start going over 230 you need to look for why that is
@Akasnacker
Жыл бұрын
Thank you Mr. Hatch, what I mean by the engine getting hot is it gets so hot it doesn't want to start it wants to die at idle. I have no temperature gauge I don't know what the temperature was but I made a 50-mile trip at the end of the trip you can tell it was running rough got out of the car looked under the hood and the lower hose burst almost in my face! I had to tape it up and limp home for another 50 miles & at low idle it was running rough & wanted to shut down every time at idle it was really hot 🔥! I have an AutoZone thermostat that I bought now I think I'm just going to go purchase a GM OEM to make sure I get an original part in there you said yours is 180 I'm going to shoot for 180 so it opens up sooner than later does that sound correct to you? Thanks, Paul
@Rayford-oq1kx
Жыл бұрын
Do you have to drill out the coolant passage in the head as well to match the size you drill in the block?
@scotthatch4548
Жыл бұрын
No the head has a big open hole there and in the gasket which is why I chose that spot
@Jesse-lu7bt
9 ай бұрын
Put a inline therostat summit makes one
@rogercorkinssr.5231
Жыл бұрын
Hi Scott, this is Roger, retired GM worker, 70 years old, and maybe doing my last engine hop up, my Cadillac engine is a 1975 500, and I would like to get the compression up to 10 to 1, what do you think of taking 80 thousants off a head surface to accomplish this?
@scotthatch4548
Жыл бұрын
Cadillac is thin wall casting so not as much material as say a Chevy because of this I don't recommend you do that big a cut ... having said that some guys have done it... I personally don't think the handful of HP you will gain is worth it ... I better tight lobe center cam will bump the cylinder pressure up and you can stay at 8 to 1
@rogercorkinssr.5231
Жыл бұрын
@scotthatch4548 Thank-you so very much for your reply, and I will take your info, into consideration!
@tommywicker1432
8 ай бұрын
How much will these cooling mods help?
@scotthatch4548
8 ай бұрын
I feel like they help a lot ...my engines run at whatever temperature the thermostat is and stay there
@torrancecody845
2 ай бұрын
Information
@jodybarry7493
Жыл бұрын
Did u drill both sides or just passenger side
@scotthatch4548
Жыл бұрын
Both sides the same way
@jodybarry7493
Жыл бұрын
@@scotthatch4548 thanks and I noticed there's one other hole that is directly to the head gaskets bigger should that be drilled out
@tellhyer7617
Жыл бұрын
When replacing the thermal vacuum switch with a temp. sensor, you mentioned that the threads on the block were 1/2”. For clarity, are those a 1/2” NPT style?
@scotthatch4548
Жыл бұрын
@@tellhyer7617 yes ... If it's a mechanical gauge make sure sender doesn't bottom out
@fadilto
4 ай бұрын
I would get rid of the thermostat.
@scotthatch4548
4 ай бұрын
You can only do that if you block the bypass passage
@miguelgutierrez8621
Ай бұрын
If you dont block that passage can it make the engine to overheat?
@scotthatch4548
Ай бұрын
@@miguelgutierrez8621 it will bypass a large amount of water around the radiator instead of through it
@pmd7771969
Жыл бұрын
Yours looks cracked at the rear.
@pmd7771969
Жыл бұрын
Just remove the t stat
@scotthatch4548
Жыл бұрын
The Cadillac has a large bypass that the thermostat blocks and removal would leave that open all the time not really increasing flow across the head like you need
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