Join Date: Dec 2000
Location: Monroe, WA, USA
if you have lifter's that are "pumping up" and not bleeding off fast enough you can get this!
what is your gross lift with a 1.5:1 rocker arm?
IMHO if you are over .500" you need "fast bleed" lifter's to help. the OEM/stock lifter's kinda go nut's with a gross lift over .500". they do not bleed down fast or enough to keep the valve closed right. all so the exaust valve has a tendancy to swell more then the intake as it get's hotter. this with the high lift causes the broblem with stock lifter's.
a long duration can cause this too. that is why most cam maker's want you to use there lifter's, not stock with a longer duration cam. they bleed off a little faster and they have a tighter control over there prodution to keep them right. OEM spec's are bitt looser then most after market lifter's.
your duration at .05 should work fine with oem lifter's, unless you have a few that are takeing too long to bleed off.
you can try to adjust the exaust lifter preload with no more then 1/2 a turn after you get resistance on the push rod. it might do the trick for ya. but if you have a high lift cam( over .500") IMHO you need diferant lifter's.
[This message has been edited by ilbl8 (edited 04-17-2001).]