Not Ranked
Ed,
Call Dennis at Olthoff Racing (spf Dealer) and ask him about the larger 351 headers. When I talked to him, he said there isn't a large difference in power (about 10hp at 5500rpm, but loss of tq down low). He was the one making the headers.
Dennis is very pleasant to talk too and very informative with these types of questions.
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CHRIS
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