FOX-GTA_89

im a 1989 trans am GTA with headers, stock exaust, stormer muffler, stock 305 heads, 1974 350 oversized .030 flat top piston with a 232 232 dur.050 480 480 lift 108 lsa.
pcm forless reprogramming?


is that what i should expect or its ****???

87TPI350KID

Sounds right to me. A new cat and catback could send you into the 13's.

stroked1990RS

good rear gears help! if you don't have some ?

BMmonteSS

Holly crap thats a big cam, I would think you would be running low 13's at least. Stock Iroc's run 14.4 ish and with free mods and exhaust work can break into the 13's.

I say you got had on the PCM's for less tuning.

GOY

If you are running a stock TPI intake, that cam is like giving an elephant a straw to breath through.... and with the stock exhaust - another straw to $hit out of. (muffelex wants you....and you should want it.)

If those heads are ported and polished, your engine is begging for an LT1/HSR intake, but may have to settle for a SuperRam if you have emissions requirements.

FOX-GTA_89

im about to change my exaust very soon but still dont know if i pu dual and dump before diff or costom 3inches Y to 3inche to a 3x3x3 muffler on stock location. By the way my gear is stock 3:45
and heads stock but soon 1,94 of intakes valves.
dond want to spend too much anymore so should go for exaust and lt1intakes.com?

87TPI350KID

TPI doesn't breath over 4500 rpm~ why do you have a cam with an 1800-5500 rpm power rang? That cam is better than stock, but it doesn't really match your setup. If you running stock TPI, open up the exhaust and intake a bit and welcome 13's. Go with a Ported aftermarket base manifold, AS&M/SLP runners, port your intake, do a good tune up (fuel filter, plugs, wires, ect) and youll be running the better part of low 13's.

What you basically need to do is allow that TPI to breath to 5500 rpm where your max power for the cam is

1989GTATransAm

iTrader: (3)

That 108 LSA is not exactly computer friendly. Like was said above that cam is way to big. Not only for the TPI but the heads. You would do much better with a cam that had about 20 degrees less duration and higher lift. I assume this is a roller cam.

FOX-GTA_89

its a flat tappet cam...and 081 heads can take more lift than 480??? should i run 1,6 stock V6 gm fon more lift?