header tube choice
11 Second Club
Joined: Aug 2016
Posts: 478
Likes: 213
From: Indiana
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
You might have a point. But calling these a small block invites comparison to the Gen I old-school small block. The LS engines outperform many of the old school big blocks. So a 2" primary tube is not out of the question, even for 800 rwhp.
my opinion; conventional wisdom goes out the window with a blown LS. i went 1 7/8 on my kenne bell 408 only because i couldnt find a 2" that would fit the car (ls converted car). you're forcing air down its throat, get the air out as fast as possible. i wouldnt really worry about a x or y pipe either unless you just like the way it sounds. scavenging isnt near as important when you're shoving air into the top end. my 3" collectors will be opened to 3.5" duals with an H pipe just to balance the sound some (personal preference)
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Teching In
Joined: Jun 2017
Posts: 6
Likes: 0
From: Albuquerque, NM
Going to run duals all the way out the back thru race mufflers and no cats. Prefer to run an x pipe. Good location for a wide band. This will be primarily a street car with trips to the track. Building it for all around performance, street, freeway, 1/4 or 1/8. Not trying to rule one area.
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