Re: OT. Externally balanced 350 question

Posted by Bob on March 30, 2007 at 21:35:29 from (69.178.229.154):

In Reply to: OT. Externally balanced 350 question posted by hogman_2002 on March 30, 2007 at 20:52:13:

Normally; a Chevy 350 of that era (pre 1986) is INTERNALLY BALANCED; meaning the flexplate is "neutral balanced" meaning it has NO counterweight.

Is that was your brother has?

If so; simply get a standard "THM-400 style" flexplate for a 350 engine of that era.

ASSUMING the engine IS a 350; if the flexplate that came on the engine is correct for the engine and HAS a counterweight; either the engine is a 1986 and up "one-piece main seal" engine OR some custom-balanced hot-rod engine that requires a weighted flywheel.

The 1986 and up "one-piece rear main seal" 350 engines have a smaller flywheel-to-crank flange mounting bolt circle than the older engines AND a good-sized counterweight; so you can't use an older "THM 400-style" flywheel on the 1986 and newer engine; if that is what you actually have.

Post back with the rest of the details... the source of the engine; and is it the 1986 and newer style?

Replies:

• Re: OT. Externally balanced 350 question hogman_2002 06:54:57 03/31/07 (0)

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