70c10

iTrader: (1)

im in the middle of a ls1 swap and purchased some long tube headers made specific for my application. they are doug thorleys 3/8 flange with 1 5/8 primaries into 3 in collectors. will they be good enough for forced induction? or should i try to sell them and do a single turbo with truck manifolds. gonna run 6-8 psi either way stock bottom end with a mild blower cam. thanks

DeltaT

iTrader: (5)

They would be OK for your boost levels, but would start limiting you if you expect to turn up the boost later. If it were me, knowing that I like to plan for growth, I'd start out with 1 7/8" unless you really mean to keep to 6-8psi max. If you do, then I'd go 1 3/4".

Jim

70c10

iTrader: (1)

so with that boost level they would be ok? or should i try to find some 1 7/8

70c10

iTrader: (1)

anyone else

LS1RedZ

iTrader: (19)

I'd go ahead and try to find some bigger headers. I know my 1 3/4 headers are choking my car @ 15 psi. I open the cutout and gain like 70rwhp. They love open exhaust!

70c10

iTrader: (1)

wow 15 psi im only looking for 6-8 psi