[olddog]

Note he said 351c 2v heads. The 2v heads have bigger valves and ports than the windsor, but they also have larger chambers giving lower compression. The 351c 4v heads are the ones with the huge ports and valves (with small chambers) that make all the high rpm HP. According to one of the books I have:

''''''''''''''''''''''''''''''''''''351W'''''''''' '''''''351C 2V'''''''''''''351C 4V
intake valve '''''''1.84 '''''''''''''''' 2.04 ''''''''''''''''''' 2.19
exhaust valve '''1.54 '''''''''''''''' 1.67 ''''''''''''''''''' 1.71
intake port '''''''' 1.94 x 1.76 ' 2.02 x 1.65 '' 2.50 x 1.75
exhaust port '''' 1.24 x 1.00 ' 1.84 x 1.38 '' 2.00 x 1.74
chamber size ''''' 60cc '''''''''''''''' 75cc ''''''''''''' 62cc

sorry about all the ''''''' but it was the only way I could make it look like a chart, as it kept taking out all my spaces.

I suspect there are quite a few aftermarket heads that are much better than the 351C 2V heads