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I believe the 302 ones are 60cc and the 351W are 64cc. Either was those heads are crap.
It would be cheaper to get a new set of GT-40P's for about $500 or find some GT-40 irons off a mustang Cobra that to rebuild and port those E7's. They out flow the E7's, have bigger valves, etc. They are a superior head.
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