Quote:

.100 plus clearance may be the problem coil bind should be set off of net lift at between .060 and .100.Bill C.



I agree.I learned this the hard way. You have to use "all" the spring as stated above. All I did was changge installed height never broke another rocker. I bet if you look at the face of the valve stem that they will have x patterens or shiny all the way around. This evidence of valve float and the "jack hamer effect". When the valve stem and rocker tip crash together the stress on the rocker is multiplied. Like a hammer hitting steel.