How long do you guys run your roller lifters before replacing then? last time i went 600 passes and one broke amagine that. so now i have the intake off to put on the tunnel ram and all the lifter seem fine......and i am at 300 runs and run the motor to 7400rpm in every gear...thanks for your advise in advance...

there's no set rule, or limit. it really depends on the cycles, spring pressures, rpm etc. lack of enough spring pressure is a lifter killer too. obviously you know not to go 600 runs again though.

I have been removing stuff out of service while it is still good , before it goes bad.

You run the parts at the beginning of their life, but you start taking chances at the end of their life.

I`ve been street driving and have made a couple hundred passes on my Isky solid body lifters and they seemed good last time I checked em. Guess I`m pushing my luck..............

If your lash starts to change, there is a reason for it. Keeping an eye on the valve lash has prevented me from total lifter/cam failures.