Ok so I bought a set of 98 heads from someone that had already been ported. They came with 343 valves and the exhaust valves needed to be replaced. I replaced them with 313 valves and was going to run a 232/236 cam .600 lift. The heads have 35 thousands taken off of them. I am concerened mainly about piston to valve clearance and that I am running 343 intake valves and 313 exhaust. Somebody please help me. I have a set of 853 castings that are not ported. What do you guys think??? I need help fast.

 

Measure! There is no better answer than that.

Measure your Piston to Valve clearances. Its the only way to verify that your combination is going to run once you turn that key for the 1st time.

If you dont have the knowledge, tools, experience, patients or any other excuse - than hire someone who can.

 

I am being told that if I go with a 224/230 cam I should be ok. I'll still need to check piston to valve clearance what is the best way to do that?

 

Comp cams posts instructions for installing a cam, which includes PTV clearance on Page #7:

http://www.compcams.com/Technical/In.../Files/145.pdf


It sounds like your shooting in the dark here, you hear one thing, read about another. A cam choice should be made intelligently, matched to your heads for best performance. Jumping from 232/236 to a 224/230 is quite a differance.

The 224/230 would probably clear, the 232/236 might also. If I were you, I'd call one of the sponsers to the Right -> that cuts many different cams, and order one specific to your needs. When you go to install that cam, measure PTV clearance, and be prepared to notch the pistons if needed.