hye guys i have the car in my sig now and i need to sell t cause i don;t have the money for a good 5-speed trans and with 6mpg i can;t afford to drive the thing, now my quaestion is if i were to buy a 350tpi bird or camaro and did headers, full exhaust, 3.73 gears and some other stuff coudl i hit 13's? i woudl liek to make it as good as it will be with the stock chip and run good. also wut kinda gas milage u guys gettin outta these things? thanks

 

Anywhere between 15-25mpg depending on how its tuned. And how much you put the hammer down.

 

Maybe consider getting rid of that cam and going with something much better like a LPE216 or LPE219 . The 216 works fine with stock chip and your gas mileage should improve a ton.

 

I have a 91 5.7TPI it has pulley's, cat back flowmaster, 52mm TB, K&N, ram air, stock 3.23 gears, shift kit, and other cheep mods, still running through stock maifolds, and I run a 13.9 @101mph!!
+get excellent gas mileage.

 

I have yet to do the major tune up due to other problems that needed attention and funds first I am currently getting about 16mpg and I drive rather aggressively - trying to break this habit - So figure an improvement in for more conservative driving and even more after a thorough tune-up

You can dip 13's easy if it's a 350TPI with all of the 'free mods' and basic breathing mods. I'm at about 2000 feet high at the speedway in las vegas and a while back before any repairs or modding and a fuel pump that was knocking on deaths door I managed a 14.98@91.8. I imagine currently I'm solid mid-low 14's due to the amount of reparation and transmission upgrades put in to date.

 

there is a guy on IROCZONE that has a 305 with stock cam and heads ...and he runs a 13.89 . kinda hopeing to be there this year

 

23 MPG before mods. 26+ MPG after mods (& with 150,000 miles).
I think it is the exhaust that gave the big milege increase. My cats may have been choking the engine some too.
My exhaust consists of cheap Summit shorty headers (1.5"primaries x 2.5" collectors) into 2.25" dual pipes that flow into a Flowmaster Y-Collector immediately behind the transmission yoke then a Hooker 3" system that was made for single cat applications with the front section cut off to fit. I have less than $500 in the whole setup, but it isn't smog legal. Noone checks (or cares) around here though.