Thread: 396 ?

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Originally Posted by BigBlockBird

I put a Buick engine together awhile back that wouldn't turn. A piston was hitting the counterweight on the crank.

this could happen with the bigger cranks 4.250to 4.750s cranks and has . i seen it with cheaper steel cranks 4.250 marked for stock rod length but not cam cut.big cranks always should do a dry run to make sure bottom of piston clears the counter weights you also need to be aware that the piston skirts can hit the side of the counter weights to .but with the small pin off set of the 366to 427 . 3.765. with this crank it should not happen and they only make a bbc pistons 9.800 deck blocks in that bore size to get it mix up less very cheap off brand ? most pistons not not have alot of pad under the pin boss . they never did a post back on what it was? who know .s it is a old post