89 IRoc Z 28

Hey Guys,

I am trying to plan a good build for my Iroc its my first one so i dont know really what to buy i have the know how to bulid it just not whats good to buy. I have a 350 Tpi, 700r4, and stock 10 bolt i for got what gear it is well my plan is to Rebulid the trans with shift kit, put new pos and 3,73 gears in the rear end. I dont know if i should keep the TPI or go to a carb. I think i am going to bulid a 355 nothing crazy for now. so whats the best cam to run and i dont know what to do with the heads if to keep them stock and rebuild them or if i have to put springs in and a differnt rocker ratio. so please give me thoughts and whats a good set up to run.

Please and Thanks for the help

RED86Z28

There is more to picking a cam than lift.
Try this
http://www.compcams.com/v002/Company...amHelpNew.aspx

89 IRoc Z 28

Thanks for the help

Blackdog36

iTrader: (3)

What is your driving style and desire for car? Need to figure out that first. Knowing each stock part limitations is helpful too.

For example stock 10 bolt will handle up to around 300hp. You can upgrade 10 bolt to withstand 400hp for a $1,000. However you can get a bulletproof aftermarket rear end for $2,400.

You can make a pretty mean 350 TPI motor with bolt ons (headers, cam, etc). I don't mean to sound vague. Just want to see you pick the right parts for your budget and goals. Let's figure out some things before you buy stuff. 3.73 gears with TPI will be tough to get good traction and make engine run out of power sooner. TPI makes power in lower rpm's. 700r transmission has steep first gear. These two combined make car good off line. Looks like you have a 3.23 rear end (https://www.thirdgen.org/1989-chevy-camaro) which is good for stock motor. Not saying 3.73 wouldn't work, just that they would be better suited to a carb or similar intake. So if you decide to stick with TPI, 3.73 gears would not be best use of $.

89 IRoc Z 28

I dont want to make race car but more less let the motor come alive. To be able to race some ppl on the street just nothing crazy.. I am going to rebuld the motor and trans this winter and next winter rebuild the rear end next winter so i can spend more money on it..

Thanks for the help

ninetyone

iTrader: (2)

I would keep it a low end torque monster! check out this article dude:Hello.
We have tried every bolt on combination you can imagine on the C4's L98 Engine and
The best bolt on modification to get Some Real HP will be a Good set of RPM Cylinder Heads Made in the USA(Cant say the brand name,Sorry). You can add 80 to 100 HP with the Correct Heads Set up to work in the TPI's RPM Range(very important) $2000.00: Heads, Gaskets and Labor. If you can do the labor your self knock off $700.00. Then a Custom Computer Chip will be needed to Increased Injector Pulse and Spark Curve/Timing for Increased Air Flow, $300.00. Now you will have to Spend Some Time with a Die Grinder(This is not hard to do, just take your time) to Port Match the Heads to the Intake, Intake to Runners, Runner to Plenum, Plenum to Throttle body using your new gaskets as a template. Not so much bigger just a smooth air flow all the way down to the new Heads, Up the Fuel Pressure a few pounds and Leave Everything else Stock, A Free Flowing Exhaust and Air intake would be a Bonus but not needed. You will be Very Surprised how much Low End(Big Block) Torque a well set up TPI Motor Will Produce with these Modifications.(440 HP/450 Torque, 355cid) And the best thing is it will Idle like a Stock Motor(no stall converter needed), No Over Heating and your Gas Mileage will Improve if you Drive it Normally!
David Steele
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Last edited by SportsCarsUnlimited; 01-27-2009 at 11:00 PM.