question - flex plate replacement

berzerker

berzerker

wookie
built engine several years ago , had balanced with stock flex plate . now removing said engine and installing into my other truck . i plan on installing new sfi flex plate onto engine to eliminate the risk of cracking or failure of oem flex plate . would it be wise to just slap on new flex plate or do i need to rebalance whole rotating assy ? the stock flex plate did not need material removed or added when balanced originally .
 
BoostedSUV

BoostedSUV

Active member
Re: question - flex plate replacement

You'll be fine just replacing the flexplate with the correct replacement. They come high speed balanced and rarely have any effect on the balance of the rotating assembly
 
M

MoJo

New member
Re: question - flex plate replacement

Th 1986-up GM V8 and V6 stock and aftermarket flexplates are neutral balanced as is and the engines are internally balanced. . Never try to re-balance a flexplate to correct engine balance. Flexplates that are used on crankshafts with a one piece seal can be switched from engine to engine without rebalancing the engine.

The counter weight on the flexplate is NOT for "external" engine balance as some people think. The counterweight on the flexplate is to used only on crankshafts that have a one-piece rear seal because those cranks do not have a counterweight on the rear flange.
 
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