tyler92

so do you guys think i would win vs . Pontiac GTP

My 383 still has the throttle body off of the original 305. So what do you think?

joeblue83

iTrader: (8)

I would surely hope so! As long as you get traction and well tuned

tyler92

well i dont think it has been tuned ever. Even from stock , but yet it still runs good. I want to get into diy prom. But it looks really complicated. i know those gtp are superchared 6cylinders. Traction wise i have a stock rearend, im about to order a 3.73 posi rear end from hawks.

327???

Depending on what's in your 383 and what's in that GTP, you might get walked. I've got friends with mildly modded SC3.8's(headers, pulley, rockers, IC, tune) that run low 13's at 106-107.

v10viper04

If the 383 runs right you should take him, SC3.8's are fast but not as fast as a 383 stroker which should have 400+ hp and a base LS1 should take a GTP with only 305 hp. you should only have to worry about the 06+ GTPs when the 5.3 was put in them.... pushin 300+hp...!

tyler92

it runs right but like i said it still has the throttle body off of the 305. wont that choke it alot? thanks for the responses@

v10viper04

Does it at least have the ultiamte TBI mods? If not, DO THEM! the 305 unit is the same as a 350 unit but the 383 requires a lot of air. You are choking it to some degree, i'm not exactly sure how much but your loosing power b/c of that. Get a 454 tbi unit and you'll be all set.

Stephen

iTrader: (12)

on the 454 TB. At the very least, drop in some TBI 350 injectors, from a truck.

v10viper04

I have some 454 injectors if you need em, they cost me about $80 an injector. and i don't need them. shoot me a PM if you need em.

fryer1979

Up here in a slightly higher elevation I have only seen a stock GTP run a high 15 second quarter mile on a good pass, he was usually stuck in low 16s. You should have him easy.

camaroal9668

The only way you lose to a GTP with a 383 is if you are a stroker! A base 383 kit should put out no less than 400hp. Is there a reason why you still have the 305 throttle body on it?

327???

You don't know enough about his specific motor to say that, it might have swirl port heads and a nothing cam OR it might be an AFR headed monster.

More info on the 383 is needed before anyone can give accurate guesses.

I just remembered about another sc3.8 around here with an M112 that traps 116-118.

v10viper04

anyone who puts swirlports on a 383 is an idiot.... my assumptions are based on him knowing at least a little engine building....

tyler92

Well the cam is a nothing cam and i think it has stock 350 heads.

I bought the car with the stroker in it and im not sure what exactly is in it.

Are Ultimate Tbi mods actually worth it?

tyler92

No thats just how i bought it.





How hard is the switch to 454 tbi? I have a guy offering to sell me the

454 tbi unit and projection manifold for $200. What else would i have to do. How hard is the install?

BigWhiteGTP

So what happened did you race? A GTP with mods is no joke. I can run mid 12's with $1500 in mods. And V10Viper, why do you bring in cars outside of the original post? No one mentioned a "base" ls1 or a GXP GP. Which btw has no aftermarket available to compete with the old L67/32 cars.

Tyler, race 'em and post the results.

v10viper04

i was using the cars i stated in comparison, showing him speeds of vehicles based on which ones will beat which...