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| + | As a Auto Mechanic From what 43yrs ago i can recall working on these small chevy engines; had a bad problem in the mid 70"s for cracking under extreme heat, mainly because GM decided they were going to reduce the weight of each cylinder head by 7 lbs. (i believe it was a 305 engine) Not only that but if these heads were under extreme work loads and heat they also could warp to the point were the exhaust port bolt holes would not line up and i had to machine a long gated 1/4" extra hole to bolt the exhaust manifold back into place. (I believe it was #8 cylinder) | ||
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