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Is it possible to get 4.125" stroke from an offset ground 391 crank?

December 4 2017 at 4:37 AM
paulie  (Login Paul_Lovett)

Reason I am asking is I have one. Well, the crank guy said he got 4.125", but I don't see how that is mathematically possible. That is unless there is more variation in factory cranks than I realized. The 391 I started with was used, but standard/standard.

The crank guy was very harried at the end and I wonder if the number he gave me is correct. I don't know how to measure something like that in my garage.

I was expecting 4.12".

thanks for any thoughts,


edit: Oh yeah, the journal was taken from stock size down to 2.100". I forgot to mention that.

This message has been edited by Paul_Lovett on Dec 4, 2017 4:43 AM

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