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Originally Posted by jm455ho
We tried 1 3/4 and 1 7/8 headers on our 455 with KRE290 heads and found a significant increase in the midrange with the bigger headers. Up to 31 lbft torque increase at 4600 rpm. #41 is 1 3/4 header and #56 is 1 7/8 header in the attached graph.
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wow. very interesting. how could my combo be so similar? maybe the combo is at the point...where the carb/intake/camshaft is such a limiting factor...header size doesn't come into play yet?
that would be my only guess.