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As usual, Charlie was right. If the fw is balanced to a non neutral crank there should be a witness mark on the fw bolt area and on the crank flange. It is very subtle and hard to spot. I was unable to pick it up but my machinist's eagle eyed son who at that time was in his twenties spotted it.
Most of the 617 fw are neutral but some are not. You won't want it wrong. And the comment about being 10 grams off ....well, that does not seem very much ....1/3oz? maybe that is a lot...?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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