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If you are referring to the flywheel best to do a search about it. You have to be very careful regarding them.
A percentage of the 123 fw are balanced with the crank. Out of five vehicles I have been in contact with in which we moved fw from one crank to another one was not neutrally balanced.
The danger is significant enough though that I will never do it without checking what the fw from the crank I want to use is in terms of balance.
If you get it wrong you will have to pull the tranny and fw to correct it.
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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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