9389coupe

iTrader: (5)

I am about to start gathering parts to do a ls swap into my 89 coupe drag car. I am still undecided on which engine setup I will use, but have a question concerning going turbo. It will be a blow through setup. I see where people use the 351w headers with ls flanges for exhaust, but will this also work on a set of turbo headers and allow the crossover pipes to work with minimal mods? I don't see any major issues other than making the crossover wider and maybe rerouting the downpipe some. Any input would be appreciated.
Thanks, Billy

Isolde

iTrader: (4)

No sense investing like that when the truck exhaust manifolds are cheap, good into the high 7s, and fit great when flipped to front dump.
There's no scavenging with turbocharging behind long-tubes, because the turbine(s) is(are) such a restriction.
Maybe get the manifolds extrude honed and / or ceramic coated.

9389coupe

iTrader: (5)

I was referring to using an actual set of turbo headers and the rest of a complete kit and adding ls flanges. If they would work that way and someone already had them laying around, that would make it pretty easy. I can get one for almost nothing locally and was wondering. I guess i will find out in a month or two.

knievel

iTrader: (11)

I have a set of Shorty LS truck headers that I cut the lower flange off of and am going to weld V-band clamps on

I think it is the best bet for those wanting headers over using the truck manifolds without paying a lot for a full turbo hotside
(Don't get me wrong, I know you can make a ton of power with the manifolds)

Isolde

iTrader: (4)

I think I finally get it. You found a bolt-in turbo kit for a 351W, but just want LSx flanges to attach the 351W shorties to the LSx heads, right?
GMPP sells the flanges, and so does Speedway Motors. I'll bet Summit and Jegs also have them.