http://www.compcams.com/Products/CC-'Hydraulic%20Lifters'-0.aspx

It was suggested to me to try the Comp Cams Pro Magnum lifters (Per CC: 370lbs rating) instead of the existing High Energy lifters (360lbs rating, if I have any issues). I was told to set the preload to .00"-.004" and this would give me more rpms.

Have you guys tried this style of lifter?

How do you set .002"-.004" preload? Do you guess with the adjustment? I have 3/8-24 adjusters. I could get .003" if I found zero preload/lash and rotated the adjuster 1/12 of a turn.

They have a .040" lower seat height, but minus my existing 3/4 turn preload (.03"), so the adjusters might be an extra .01" farther out which is a wash. I could keep my existing push rods if I went this route.

Thanks again.