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I am planning on checking spring pressure first, and replacing if they're not up to spec. Just a thought while I'm in there is there any benefit to also swapping lifters. the original question, "Does anyone have any experience switch from the Hi-Energys to Pro mag lifters?" BTW they are 2...

Rockers are indy's 360-R4-4SR, 1.5's with 3/8"x 24 adjusters which work out to .040"/full turn. checked my notes, set at 1.5 turns so thats about.060" preload, probobly should back them off some.

I have a Q in @ Comp to see what they say the RPM range is, the specs are aprox 250 @ 50 with 508 lift on the intake and 525 ex. i do have adj rockers. I want to say I set the preload @ 1 turn, So i'm in the ball park but that is something I will ck and document when i ck the springs.

The cam is a custom ground Comp. and the lifters I'm referring to are both Comp's http://www.compcams.com/Products/CC-%27Hydraulic%20Lifters%27-0.aspx I'm well aware of the contributing factor to valve float/bounce, just looking for opinions/ facts about the two diff. lifters I do plan on...

The Pro magnum are totted as allowing more rpm's/less susceptible to pump up. Does anyone have any experience switch from the Hi-Energys to Pro mag lifters? I'm currently running the Hi-Energys and it's getting into valve float/pump up around 6150~6200. I plan on checking springs first but I'm...