MeentSS02

iTrader: (11)

Don't fall in to the trap of buying a non-hardened push rod because you want it to be the weak link in the valvetrain. That just isn't how it is supposed to work. The pushrods were never meant to be used in that fashion, and should not be.

If you hit the rev-limiter, you aren't doing any damage, unless you set your rev-limit to 8k RPMs or so. The rev-limiter is doing just that - limiting the engine RPMs. If you mechanically over-rev the engine, you either need to learn how to shift, or take it easy on the shifts. That is purely user error.

ArrestMeRed99Z28

iTrader: (1)

Every material has some elasticity to it, so a pushrod may bend a little underpressure and then straiten back out when it is not under load. If it bends for good you will hear it tick. I had bent a pushrod and heard it ticking, checked the PRs and couldn't find the broken one so i put it back together and it was still ticking so I jumped on the throttle and it stopped ticking, cause I snapped the pushrod in half, with a stock cam. You're better off putting in hardenend PRs the first time because you will break lots of PRs and end up needing hardened ones eventually any way. So I suggest you put in hardened PRs the first time and forget about it.

Sorry for the long *** post
AJ

1320 killer

iTrader: (6)

yes, after the cam install your gonna need longe ones.

muncie21

iTrader: (14)

Actually both engines use 7.4 pushrods. The LS6 has longer valves to make up for the smaller base circle of the cam.

On the subject of hardened PRs.
For mild cams/springs, I go with stock PRs. The stockers aren't going to deflect during normal driving with 918's (on a small cam) or stock springs. If you mechanically over-rev, I'd rather be replacing pushrods than valves and pistons.

Once you go to a bigger cam (one that requires more seat pressure) then you definately want to use hardened pushrods. The amount of force required to lift the valve from the seat can cause deflection during normal driving.

NBMgreg

iTrader: (7)

dangit, everybody has different opinions, lol... seems like both work well for certain people.

FWIW, i am running a g5x1, 228/232 .588 .574 114lsa, and 918 springs.

any more opinions?

MeentSS02

iTrader: (11)

You'll hear a lot of differing opinions on the topic...just like you would about "which cam should I get?" I personally would opt for hardened pushrods for valvetrain stability. After seeing some high speed videos of a valvetrain in action, it needs all the help it can get.

NBMgreg

iTrader: (7)

ya, the only thing thats making me lean towards hardened ones is from the deflection like some people were mentioning, if i ran stock, and they were deflecting... i could be leaving power on the table by not opening the valves all the way, and i would never know it.