Thanks, Sorry guys they are the open chamber heads, wow never thought of it that way. but it does sound like a piston coming up and hitting the bottom of the head. I will update you on what I find when I tear it down.
Now, you have me going, what is involve with converting this cam and lifter to a roller retro. I would like to hear the motor shake a little bit harder. in doing this, should I find that the piston is hitting the head, are what are we talking about doing to raise the head up? I dont feel that it is the piston hitting the valve only because I think more problems would have already developed. such as bent valves when adjusting them. Let me know what your thoughts are.
I will keep you up to date when I remove the heads......
Again Thanks