Ok, im gonna be getting my hands on a 1987 Iroc-Z with the 350 TPI in it. The setup under the hood is all stock at the moment. I wanna push 300-350hp, but still have to pass smog. My goal is to run in the low 13's on the 1/4 mile. What kind of suggestions do you have for me? Does anybody have a car that runs like this and passes smog fine?

I have no problem investing some money, but what order should i go when it comes to the upgrades?

 

That shouldn't be too difficult. Kevin is in the high twelves with a 350 now. He's running a set of Corvette aluminum heads with the lt4 hot cam. He had to run a Corvette style egr, since the heads don't have egr passages. He's also running a large base and runners with a proted plenum. Kevin's dad, Don, is building a 350 with Vortec heads, and the new Scoggin-Dickey Vortec/tpi base. Chevy High Performance built up a goodwrench 350 with Trick Flow 23* heads, and got 416 hp out of it. They did that with a Holley carb, but a tpi should do as well. Again, you would probably need a large base, large runners, and a proted plenum to get the max out of any tpi combo on a 350.

 

I'm close with my 91....
about 310 HP
Smog passed in NV.
Visual and Sniffer.

 

It won't pass in Ca. if you change a fuel injection system for a Carburetor. I think 1986 is the last year for a carb to be legal on a f-body.

 

I reread Snowdog's post, and realised that he has a Holley throttle body, not a carb. I tried to delete my post, but the board wouldn't let me. Sorry for the confusion Snowdog.

 

I was going to respond with "Huh?" I'm glad you noticed. Yeah I was freaking out when they were doing my emissions check. I was scared that it wouldn't pass and would have to pay through the nose to have a diagnostic done. Thank goodness everything was done correctly! The car runs like a dream, and actually had better results than the stock engine! (Go figure!)

I suppose that the former owner of the car didn't take too well care of the stock engine, for the oil pump went out on it a few months after I bought the car. Now I have a nice setup and a very strong engine that will last me for years!

 

Your friend is passing smog in CA while running a lt4 hot cam? wow, i wonder if i could get by passing with a zz4 cam (.474/.510)

 

The ZZ4 cam is cakewalk compared to the LT4 HOT cam. You'll have no trouble passing with it. But like anything, its all a combination of parts. If something is out of tune, it will affect everything else.