nemss1

i hav a 2000 ss auto with 3.23 rearend. how much would installing 3.73's, shorty headers and asp underdrives drop my 1/4 mile time???

Ironxcross

iTrader: (8)

14.3 at 96

89txiroc

iTrader: (1)

If you decided to go with long-tube headers, which are better for the ls1 engine, with the 3.73 gear and underdrive's I'd expect anywhere from .7-.9 off your et.

Personally, I went from 3.08 gears to 3.73's and picked up .6 in the 1/4

99monguse

That car should have no problem running 14.0-13.7 @ 98-103ish with a 1.9-2.0 60ft. Unless you car has engine trouble or something; there is no way a 2000 SS automatic with 3.23s should be as slow as 14.3 @ 96 mph just no way(unless of course you can't drive at all or the track just plain sux). My old *** 1995 LT1 Formula with an automatic and 2.73 gears AGAIN 2.73 2.73 2.73 ran 14.4@95mph and that was on the stock OEM tires (trying to remember...225-60r-16 since the car didn't have the performance gears it didn't get the 245-50zr-16 tires) and the rest was completely stock. Now my 1998 Z28 with an auto has the 3.23 gears and it ran a best of 13.9 @99mph and at the time it had a BLOWMASTER muffler and the original owner had backed into something crushing the exhaust tubing(I replaced it with a Borla but never took the car back to the track since our local track sux, it wasn't worth it).

I would think installing 3.73s and shorty headers and pulley would net you a few tenths and a few mph...without a baseline it's hard to say what the mods should give you. But if I were you I wouldn't bother with shorty headers, go with either mid-length or longtube headers. Just remember the 3.73s will make you spin a lot more off the line. If I were you I would get: the mid-length or long-tube headers, a good y-pipe and exhaust, reprogram the PCM(remove torque management mainly and obviously a quality tune), drag radials, SLP CAI (cold air induction kit)brings cold air directly up to the airbox, since the hood is really for looks.

nemss1

ironxcross, a stock ss ls1 runs high 13's. 99monguse, do u think i will drop half a sec with 3.73s, asp's and headers?

5_02ls1

iTrader: (20)

i installed 373s lingenfelter intake ported tb pacesetter longtubes custom ory and a cutout ...with a mail order tune it neted me 1.1 and 7mph in the 1/4.....this was at a horribly slow track.....14.5 at 98 stock 13.4 at 105 after bolt ons on et streets....if you are at a good track around sea level elavation you should run 13s at 104 or better