Magnum Heads

After I wiped out my second cam I had to do an inspection of everything. I checked all of the machining records I had, talked to the people that built the engine originally and made a lot of measurements. I was getting about .085 preload on the lifters. Way to much for a hyd. flat tappet cam.
As it turns out, the machinest had forgotten to tell anybody that he had decked the block by .070 to bring the pistons to zero deck. All is well now and the geometry for the valve train is good with the rollers not impacting the edges of the valve stems. I have been told by a couple of engine builders that the noise from the rockers I have now is how it is supposed to be. It was a little disconcerting at first though.

Jack