I checked out the springs. The World springs (830110) seem more suited for a hydtraulic roller cam...not a flat tappet. They are rated at 130lbs on the seat at 1.850" installed height. You are probably closer to a 1.750" installed height. I don't know the spring rate, but I bet your seat pressure is 150lbs or more and your open pressure is 350lbs or more. That's what I run on my hydraulic roller that is turning 6800RPM. The Lunati spring is 108lbs on the seat and 340lbs open. The springs MAY be causing lifter collapse, not valve float. How did you set the lifter preload when you installed the cam (1/2 turn, full turn, etc)?
Mess with the timing first. If that doesn't get you anywhere, you may want to try setting the valves again. Find the zero lash point and do 1/8 turn preload. See if it makes any difference (good or bad). |