Thread: 350 with 4 deuces, help build

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Over boring is capable of causing over heating problems. Cylinders are precision cast for location, this means that the more precise the casting the less wall thickness is needed for the cylinders. The small blocks are a case in point, being capable of only .030 safe over boring with out sonic testing. At .030 over many blocks will have less than .100 wall thickness left in some areas. Consider these areas to be suspect for hot spots, as many blocks have lost wall thickness over the years to water jacket rusting. Im not saying that over boring can not go past .030, I am saying better safe then sorry to have it checked before building the .060 over block and discover this after the fact, but without regard for verifying wall thickness, .030 should be the maximum for a safe buil that will see alot of extended period cruise time.