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1988 Corvette Z51 4+3
Ported TPI
Moates Adapter - Chip from MrWilly
AIR Deleted, EGR Deleted
ARH Exhaust, Long tubes 1 7/8 x 3" - X Pipe - Corsa 3" Mufflers
Cooling upgrade with toggle switch if needed
ZR1 17" (275 - 40 R17's)







Currently the car has some form of a L98 in it, the engine is fresh and much healthier then the stock 245hp version. I think some one replaced it with a ZZ crate engine.

I got a great deal on a 383 short block ($800) from a local Corvette guru here in Colorado...

He was building this for another Vette owner, and he ran out of $$.

It's a 4 bolt main, non roller block - Scat 400 crank, TRW Forged Pistons, all assembled ready for a cam, oil pump ect.

My plan is use a 100hp shot of Nitrous and maintain a street driven car, I would like to keep the TPI since it is ported a lot. Replace the throttle body, injectors and keep my 113 heads.

What should I punch these heads out to with a cam package that keeps me still street driven but gives this car a good wake up call? I would like to see 350 to 400 RWHP before the juice. I think it can be done with the TPI.

Thoughts? I'll post some pics of the short block tomorrow.

vetteoz

You think?

A 383 with aftermarket heads and a serious cam
400 @ crank with TPI

http://xtremecarzone.com.au/index.php?showtopic=386

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http://www.gmhightechperformance.com...ide_plate.html

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Good read, thanks.

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It will probably be better to just save the extra cash and go with the AFR Heads that MrWilly suggested a while back...

I want to keep that TPI though, low end torque numbers really deliver the package where I use it the most. I wish I had the time to take the car to track and drive some street style courses verse just a 1/4 mile run.

Maybe when I retire from Army, I can have a little more time to enjoy the car

cohocarl

We all like pics.

Nice exhaust system.

383vett

Your build looks encouraging. I might mention that you need to make sure the whole package follows a common theme or you will be leaving horsepower and torque on the table. You mention that you want to run the tpi intake. This is inherently a low to mid rpm system. The 383 is inherently a torquer motor due to its bore/stroke ratio. Your 1 7/8" headers are too large for the motor in my opinion. You need increased exhaust velocity at midrange rpms which will increase scavenging at those rpms. I would choose a 1 3/4" primary and I think you will be very happy. It looks like your headers are new. Maybe you could swap them out. Your cam selection will depend on your heads and compression ratio. Definitely don't overcam the car. I ran a 222 230 Crane hydraulic roller cam on my bracket 383 with a SuperRam and good flowing heads which I shifted at 6200. I would recommend a cam no larger than this no matter what others might say. Good luck with your build. My .02

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Yeah, I was thinking the same thing - but for the same price I was able to get the larger header and did not want to pass that up.

The Stealth Ram and FIRST intake systems do intrigue me. The last 383 I built (Firebird) was in a 2.8 V6 Firebird (1986) with the 700R4. I replaced the v6 with the 383 but ditched the TPI and ordered a Painless wiring kit from Jegs and adapted everything to a carb. Figured I'd give the TPI a shot this time around.

cv67

What 383 is saying is youll be blowing torque right out the tailpipe with the 1-7/8 bigger isnt always better
1-3/4 will take 600hp no problem and once youre past 1-5/8 sometimes getting to plugs is a pain depending.
Havent heard much complaint on the vette headers though.
You wont see anywhere near 400hp to the tire but you will have more torque than you know what to do with.

65Z01

On the motor I tend to agree but with a 100-shot should be there.

BTW, what's your altitude in CO? Those HP numbers are normalized to sea level and the DA can make a huge difference,

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I am around 6500 feet above sea level, but this is not a permanent location for me, I am from MA and plan on moving back to NH next year sometime.

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I have no issues getting to the plugs, ran into all my issues on the install of the headers, let me ask you this - What would maximize the installation of the current exhaust system?

383vett

Back to the headers. These are larger than what I am running on my 406 bracket car that spins to 6700 rpms and sees no street use. I am running 1 7/8" on my C6Z which is a 427 and relines at 7000. If I had to do it over again, I would go 1 3?4" for that car also since it spends most of its life on the street. Is there any way you can swap out to 1 5/8" or at most 1 3/4" primaries?

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Yeah I can prob swap them out.

tunedport85inject

I agree with 383, 1 7/8 primaries for a 383 build are waaay larger,never heard here.Even 1 3/4 are very large for a TPI based build on a 383 displacement.i think you can go with a 1 5/8 primaries ,but i know you'll choose 1 3/4.

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