Quote:
Originally Posted by Skip Fix
"Just an FWI pushrod lenght has nothing to do with lift."
Pushrod length does change net valve lift. Pete McCarthy even had an article on it years ago in Pontiac Enthusiast. My simnpistic tho0ughts are it is cganging where the rocker tip hits the valve tip and actually changing the true lever length slightly, or hitting the roller(or curve of a stamped rocker) at a different point doing that. Get several different length pushrods the same rocker and a solid lifter and a dial indicator and you can see it yourself.
"That all really should've been sorted out while doing the geometry check with the adjustable PR and solid checking lifter,but you have to be sure everything was the same like the height of the pushrod cup in the checking lifter vs. the hydraulic lifters that will be used,and then you have to account for the hydraulic lifter pre-load as well,so it's easy for things to get away from you when doing this,as we're talking about very small differences in actual PR length (.100" to .200")."
So how do you guys using hydraulic rollers do this?? Get and extra and make it solid?
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Ok so an improper length pushrod may increase lift a few thousandth the engine will never see but you will see the worn parts from the poor geometry so whats the point? Are you saying if your combo needs more lift all we need is longer pushrods? Get real here. The lift is what it is unless you change the cam or rocker ratio. Your splitting hairs. The proper geometry will yeild the valve lift the cam was desighned for and keep parts wear to a minimum. With so many length valves now availible for our Pontiacs every combo needs attention.