1-7/8 or 2in
From what I have read and seen through forums and people doing dyno tests, the 1 7/8 is usually better but it mostly comes down to the design of the header. Depending on the vehicle, if it is a real compact vehicle a larger header usually takes sharper bends to make it fit which can reduce flow and power. So It depends on a lot more factors than just the cc of your engine. What setup, what kind of vehicle, long tube vs short tube.
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From: Wilson n.c.
From what I have read and seen through forums and people doing dyno tests, the 1 7/8 is usually better but it mostly comes down to the design of the header. Depending on the vehicle, if it is a real compact vehicle a larger header usually takes sharper bends to make it fit which can reduce flow and power. So It depends on a lot more factors than just the cc of your engine. What setup, what kind of vehicle, long tube vs short tube.
71 nova 416 super vic accufab tea 243 heads
