The situation: I have 88 GTA w/ Lt1 Afr 195s port matched to the intake manifold 30 lb injectors comp xtreme energy cam 224 duration 535 intake 550 exhaust 1.6 to 1 roller rockers headman shortie headers K&N filter flowmaster american thunder exhaust 2400 stalll speed and a 3.70 rear gear

The datamaster I am using says that I am running 13.7 in the 1/4 mile. (I ran 13.7 before the cam cylinder heads and roller rockers were upgraded) Does this seem ridiculous?

I found out that we had a spun rod bearing so now we are making it into a 383. I was wanting to know what I might do to match my combo better maybe a 58mm throttle body instead of the stock one?

What kind of times should I get?

 

I'd go w/ either a 52 or 58 mm tb. Don't know if you will pick up any power or not over a 52, but might as well go 58 is you are spending the money. I have a 58mm and it seems to work fine.

If everything is done right, I'd guess you should be in the high 11's, low 12's, depending on traction, tuning, and supporting mods.