Originally Posted by Thunderstruck (Post 2943778)

My dyno pulls were with the same springs, different lifters.

Also check to make sure that the pushrods are the correct length, a long shot but it is part of the process.

Don't know about the lift issue with 496 lifters, definitely something to look at there.Yes but then why no problems of insufficient oiling for all those hours? Good point

Originally Posted by TWIN-SPINS (Post 2943796)

rage i had a lifter go bad ,,,it knocked the push rod off the rocker arm,,,the hydraulic lifter would not compress at all,,,was told it could of broke the stud,,,in my case it didnt

Originally Posted by Thunderstruck (Post 2943395)

My 502's with Crane hydraulic lifters floated the valves on the dyno at 5600 rpm, just a thought. Morel lifters didn't float up to 6000 (stopped the pulls at 6000).

Originally Posted by Rage (Post 2944187)

That is interesting. Do you know if the valves floated with the Crane hydraulic lifters at 5600 rpm because they were pumping up?

Originally Posted by Rage (Post 2944174)

That is very interesting. Exactly how does a hydraulic lifter malfunction so that it would pump up its adjustment length and thereby hold a valve open against the valve spring preload?

Originally Posted by mrfixxall (Post 2944247)

oil pressure!! if the retainer clip that holds all the internals in the lifter comes out then the lifter will keep expanding and could cause the valve to hit a piston at higher rpms..

Originally Posted by Rage (Post 2944294)

Good to Know. So if the lifter snap ring is still in place this should not be a problem at present....correct?