Possibly could be the lifter....are u sure that teh push rods are of coorect length? big question also is..are the springs stock? I know said you didn't know but find out...springs should be one the first things to replace when switching heads and using different rockers...espescially if you are hard on the car...high rpms and such...TF makes a nice valve spring and that was my first thing bought after the rockers...heck-even if it is the lifters -they are relativly cheap and easy to replace--a couple of beers and a afternoon...good luck
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