OOps. Broke her tonight..

[DamnYankee]

Those are PAC's.

I was referring to Comp's. A lot of the big HP cars are running Comp 921's. They're making big, big numbers and the springs are lasting over 40k miles. It's recommend that's when you change them out though.

[CHEVROLADE]

Those are PAC's.

I was referring to Comp's. A lot of the big HP cars are running Comp 921's. They're making big, big numbers and the springs are lasting over 40k miles. It's recommend that's when you change them out though.

yea the ones i posted that are broken are Comps...they are Skeets..maybe he will check in...

i was linking the OP the PACs..they are good as well

[Frenchy]

Skeet's are the only 921's I've heard of failing. But I've personally seen the trunion upgrades for stock rockers about a half an inch off. Multiple FAST intakes that simply do not fit. Heard of a few cams, that are varying in spec from cylinder to cylinder.