First I just want say this is one the best sites on the web for finding info on making you car better. Thanks to all!!

I have a 91 firebird that I just installed a 350 engine into. The engine mods are as follows. bored .040 over, flat top TRW forged pistons. .480"lift 230 duration cam, 2" tbi unit from xtreme-fi with 90# injectors, 193 heads that have been pocket ported, Headman header, 3" exhaust(no cat). I also have a 2400 stall converter. My question is what rear gear would you guys suggest for my combination? I also would be interested if anyone could speculate what ET may car would run if I get the correct gear and proper tuning? I wish I would have found this site before I built the engine. I may have chose a different cam and heads but it is to late for me now. At least maybe I can get the gear right.

This is only my second post on this page. I hope I have posted it in the right location and have not broken any rules with my questions.

 

go to the track, aint too expensive, wednesday nite drags at the 2 "local" tracks are 15 bux. Then you can calulate for tire height n what not.

 

Not knowing what trans you are using i will say:

Auto - 3.42 rear
STD - 3.55 or 3.73 depending on 5 or 6 speed and what you want you final cruising rpm to be.

Don't forget to match the convertor to the cam if the trans is automatic.

 

hmmm, with a 230 duration cam and 350 cubes, id have to say steeper then that. Id get 3.73s auto and 4.10s standard

 

cruinsing speed will be outrageous with anything over 3.73 and no overdrive.

 

Thanks for all the info. I have a 700r4 tanny with a 2400 stall converter. As far as crusing speeds I would like to be able to still drive on the interstate. Mainly because I have to take the interstate to get to the track. The main goal for the car is a weekend driver that I can take to the track and go bractet racing without being to Embarrassed. Thanks Again.

 

3.73 would be a good choice.

 

yeah 3.73 with 700 would be good all around

is how i would go in mine anyways, ive had a couplr third gens with 700 and 3.73 and v8

very fun and good on highway also

good luck
'

 

looks like 3.73 is the gear i should go with. Thanks for all the info