Alright, just a quick question outta curiousity here....I have a 1990 corvette TPI, makes 255 HP stock correct me if i'm wrong....I'm wondering how much power can actully be drwan outta if? with say a full exhaust, long tubes and a flowmaster muffler and 3 or 3.5 inch exhaust, then a bigger air intake pipe and filter, and then minor porting through the TPI plenum, base and runners....the thing is, i dont' want to have to mod the computer, I just want to do build up the motor a bit....how much power can I get outta a stock aluminum headed L98???

 

290-300 id say but id do some PROM work

 

One of the best things you could do is the EProm work. Great mod to do.
300HP is not hard to get just do all the free mods and some good mod choices and you will get there with no problem.