1 3/4" vs. 1 7/8" primary headers
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From: Phoenix, AZ USA
1 3/4" vs. 1 7/8" primary headers At what point does the 1 7/8" become a big gain over the 1 3/4"? I'm hoping to get 500rwhp out of this new 388 but am wondering if the 1 3/4" Hookers I have are going to have much resistance to flow.
You might want to check out a set of stepped headers. I believe Kooks recomends anything over 450rwhp you should step up to stepped headers, but I'm not sure you would need to go all the way to 1 7/8 with a 388.
Launching!
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From: Trois-Rivières (Québec / Canada)
If your goal is maximum peak HP, then go with stepped headers. Otherwise, if you're looking for strong low to mid-range, I'd stay with 1 3/4.
1 7/8 are better suited for 422+ big cubes engines.
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Eric D.
99 Firehawk M6
1 7/8 are better suited for 422+ big cubes engines.
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Eric D.
99 Firehawk M6
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I would LOVE to see a full length 1 5/8th header with 3 inch merge collector. I think people tend to go too big on headers. I bet a street engine (idle to 6400rpm) would see big torque increases from a properly built 1 5/8th longtube...
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its a 4.130" bore X stock 3.622" stroke engine. As I said, I'm looking to make 500rwhp but more than that isn't a big deal and I'm not really up to pay $1000+ for new headers unless its REALLY going to get me something (thus if the 1 3/4" headers are going to work then I'll stick with them). 
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From: AUSTIN TX
Originally Posted by Chris ARE 360
I would LOVE to see a full length 1 5/8th header with 3 inch merge collector. I think people tend to go too big on headers. I bet a street engine (idle to 6400rpm) would see big torque increases from a properly built 1 5/8th longtube...
