.780 lift! That's double of normal. What's in there for rocker arms? If you still have the standard 1.5 to 1, you might consider dropping the cam to a lower lift and going with 1.6 to 1 rocker arms to get the same valve opening.
Regardless, this is typically caused by coil bind when the valve springs are fully compressed and need to go more, or it's from excessively strong springs to prevent valve float at high rpm. With a valve fully open, see if there's room to slide a feeler gauge between the coils. If there's not, back the rocker arm nut off a little. With solid lifters, they can't bleed down like hydraulic lifters so you'll have to live with the clatter. There may be dual springs available that have thinner coils to allow more clearance. The inner spring is a regular spring instead of the wound-up strip used to dampen vibration.
Saturday, March 3rd, 2012 AT 12:50 AM