273 dilemma

fireguyfire said

So in my research it shows that the throw is different on a 318 crank than on my forged 273 crank.
Is that correct?

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No. 273 and 318 cranks are for the most part interchangeable. Bearing journals and balance. 340 cranks have the same bearings but because of the heavier pistons and rods, their counterweights are heavier.