Here's a very handy chart I use to help in head selection. There's a couple of 57-58 CC 305 heads available that respond very well to porting and larger valves if you're planning to build a full-race engine. Otherwise, just do a good cleanup/deburr job on the stock head and stick with the original valve size.

http://www.fastnuf.com/Headguide.html

Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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