Does anybody know what is the difference between the first generation full pressure 235 heads and the last generation used from 58 to '62. I have read higher compression. What happens if you switch any of the valve train, cams, valves, lifters etc. They all look damned near identical but are listed separately. If you swapped a 58 to 62 head onto an earlier 235 would you have to change the camshaft?
