First Gen F-Body LS-2
 

If I'm installing an LS2 in a 68 Firebird are my only options for a shorty header S&P? I was told an exhaust manifold from a ls1 camaro/firebird will also fit?

ATS and Hooker have full-length headers that will fit, depending on motor mounts used. There may be a stock manifold that clears, but I wouldn't want to give up the power and torque of the full-length headers.

Jody

Also, Stainless Works makes long tubes, and Wegner Motorsports makes 4-2-1 shorties:

http://s41657.sites80.storefront-hos...x?CategoryID=9

Not sure the wegners will fit a stock subframe, I know they fit a DSE front clip.

What would be the difference in hp and torque between long tube headers and short tube headers?

Long Tube =100 hp/100 torq

Short Tube = ??? hp/ ??? torq

Thanks,

Ty O'Neal

Good long tubes are worth 25-35 ft. lbs. down in the low/mid range on a decent small block, sometimes more on some combos. Probably less on a milder combo with cats.

I do remember doing a 458 hp 383 LT1 in my 93 Vette, and Myron Cottrell at TPIS begging me not to run shorties, which I wanted for legality here in California. He quoted the same numbers and seem to be pretty close to what I've seen through the years.

Jody

There are probably hundreds of posts on LS1Tech.com relating to this topic, but to generalize, on a performance cammed 5.7L or 6.0L, shorties are worth minimal to no gain over stock manifolds, long tubes can be worth 20-30 HP and maybe even a bit more than that in torque. The higher end designs with merge collectors do seem to be somewhat better than the conventional cannister-style collectors, but not hugely so.

Edit: Funny, I was typing my response before I saw Jody's, so there seems to be some consensus here.

We have a set of Stainless Works that will be finished in a couple weeks if you need some.