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I want to put a new GM performance SP383 small block in my '70 Nova & mate it to the older style Muncie 4 speed that's already in it. As far as I know this should be a pretty simple swap. What flywheel should I use? Thank You! Bill
 

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Find out what flywheel is needed. I think the engine you want may be a 1 piece seal engine and MAY be externally balanced. Other than that I would get a 30 lbs SFI steel flywheel.
 

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I would expect that GM balanced the rotating assembly to allow use of any externally balanced flywheel intended for a 383/400 with one-piece rear main seal from the past 30 years. A number would be available from both GM and the aftermarket.

"Requires 1986-1999 350-style externally balanced flywheel for manual transmissions."
 
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