[performerrpm]

i ran one of the older balancers for years on my 66 no problems. just wonder if on a 400 at 500hp or below if anyone thinks theres a problem with them...on a street strip type build?

ive got several later 68 covers and later 11 bolt covers but since i have a nice 64 cover/balancer/pulleys that seem to be garnering 0 interest, i was thinking of using them.

while im degreeing the cam and have the #1 piston exactly at tdc i was thinking of installing the cover and balancer and adding timing tape. since tge 64 cover has only a pointer i dont know any better solution.

i expect this 400 go need to spin to 6500+ with the 290b cam thats in it.

[steve25]

I would not use a smaller OD balancer on a motor that will buzz up to 6500 even if it was just made yesterday.

[performerrpm]

the rpm range is whats had me worried. ive got this motors original 11 bolt cover along with a stock replacement balancer that might be the best option.

[SRGN]

If you are going over 6500, might be time to look at an SFI unit.

[PAUL K]

Pontiac made a performance two piece damper. It's about double the width of the standard unit. That's the hot set up for a performance build when the want to maintain the correct look for an earlier build.

[TXSTARFIRE]

What was the application for this performance two piece damper? I have a damper from a 67 428 HO that is larger than standard, it sticks out of the pulleys a small amount. Most dampers that I have seen are completely inside the pulleys.

[performerrpm]

i never knew they made a performance version from tge factory. i seen butler has their new performance version but im not sure what might be better about unless its just the material or the fact its not over half a centry old. i may just run the later version on it for now since i did snag up a bargain on some pulleys the other day

[Dragncar]

Not sure what balancer came on the 1970 455 #64 headed engine. But I ran it for years with no issues. Sent it to Dan back in the day and he checked it out and added timing marks.