JB Weld ExtremeHeat is basically Bondo for engine blocks. It has very little tensile strength but high compressive strength. It won't hold anything together, but it's very good at plugging holes. In this video I show a technique for cleaning up minor pitting and low spots on the surface of the engine block before a gasket is placed on it. This helps the gasket seal properly. J-B Weld ExtremeHeat is suitable for use near combustion chambers and exhaust manifolds. This is a great solution for Model A engine blocks and other antique cars that have seen a lot of wear and tear. Typically the recommendation for these is to deck the block, i.e., to lower the surface, but if the damage is only superficial there's no reason you couldn't repair it by raising the surface.
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Repairing block surface pitting with JB Weld ExtremeHeat
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