Hey guys, Im finally getting myself involved in a fuel injected thirdgen. The car I bought came with a stock TPI ZZ3 crate. What are the potential of these motors with the heads and cam that it's got?
so far it's ran a best of 14.9@93 but you can literally feel the power fall off after 4500. I'm thinking intake improvements and exhaust is the way to go first off. If i want to see 13's though, will i need to change heads?

 

Falls off at 4500 eh... sounds typical of stock TPI to me. My 305 pulls until about 4600-4700, then that's it. Exhaust will make a difference for you, especially if you're running through all stock exhaust, but it won't necessairly let you pull any higher. I would say go for a high flow base plate, some aftermarket runners, port your plenum out, and see how it acts from there. I don't think the cam would necessairly be that bad, nor the heads.. but I bet you could still buy better. The Intake and Runners should take your powerband a little higher, but I wouldn't be expecting much over 5200, and that's probably pushing it.

 

I had 3.42s, 160 stat, 88 gta aluminum drive shaft, air foil, ported plenum, timing at 12 degrees, 50 psi fuel pressure, Home made ram air behind my fog light openings. ZZ3 camshaft, stock 1.5 rockers, headman 1 5/8 headers, no cats, dynomax super turbo muffler, Trans pac shift kit, underdrive pulleys and stock chip, stock heads, intake and injectors. 13.11 at 101.6 is my best time on slicks. So you should be able to get in the 13s really easy with the heads you have. I run the car at about 180 degrees engine temp for best times. Traction is the Key!!