Convert a Chevy 400 from auto to manual.

[brickyard69]

How would you convert a 400 Chevy (externally balanced) from a flexplate to an flywheel without disassembaling a re-balancing the motor?

[dhardison]

Use an externally balanced flywheel. For example:
http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?lang=-1&catalogId=10002&storeId=10001&categoryId=21591&searchItemId=66295

[Madspeed]

Allthough the 400 and 454 use externally balanced flywheels and balancers.
You need to know that they look identical but they are off in weight by enough to cause a problem with balance.
My advice is to make absolutly 100% that you have the 400 flywheel =)
my .02c