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I've seen plenty of 8-bolt B20 cranks with .002" bend at the middle main, but you would expect it from the stupidly heavy rods & pistons they have, they really needed to be fully counterweighted.
Too many different engines with different combinations to give give set answers
I'll be more specific then, What length are the rods that you use with your 92mm stroker? Does it use 2.0" SBC BE Bearings? Is the crank fully counterweighted? Does the block need much grinding with the rods you use? Does the crank actually start from billet like billet rods use to, or is there such a think as a generic forging that they start from these days like they do with rods? Will the crank/rods/pistons be available seperate later as I wouldn't want to pay transport cost on a block from half-way around the world.
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