I know I am jumping in here a little late but I have to agree with Rev I am running the 351 heads with 202 164 chevy valves on a 4-v 289 Ede Perf, RPM in take and a llightning pickup cam and have run a best of 13.2 armed with that info you can make your own fdecisions but I think they are a great street head for the money assuming you do the port work your self.
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