i have a 1993 z28 m6 with 205k on the body,and possibly the engine too

it still runs pretty strong,but i need a game plan for future build.
exhaust will be straight foward long tubes with 1 7/8 primaries and a 3 inch collectors 3 inch y-pipe and some decent catback without the slash-cuts!

heads will be stock with 2.02/1.57 valves and flow 265cfm hopefully i can find a set of 643/374 castings.

intake will be stock as well and i am not sure how much meat there is,but hopefully i can get some gains porting them as well

cam???most likely i'll give bullet a call..i have had good luck with them with my fords...

if i go crazy i'll do a 383,but most likey i'll do a basic rebuild and put some forged pistons in there,and be in the 11.1 compession..

now the big question which will decide most of my direction...

what is needed or advised to do with increasing injector size..re program/chip/or some data logger? i'm used to ford computers so not sure how the gm computers work??

i like to get 380 rwhp on pump gas...

thanks for any prior experience input you all can provide in advance.

 

Before you can establish anything, what is your budget?

 

380 at the wheels isn't a terribly hard target..and you won't need a 383 to get there. As Joe mentioned, start with a budget number and work from there.

When you get to it, a custom tune is what you need. There are several mail order guys that get you in a pretty good spot and you can often improve from there with a dyno session. It's remarkably inexpensive to get one done and they tune for everything...including any injectors you care to throw at it.

As for a cam you might be better off having a custom one made for you. I didn't and haven't had any issues but the cam in my car is an old design and might be a bit inefficient. I'm happy with the performance and the car runs/drives fine. It could easily be a daily driver if I actually drove somewhere every day.

Enjoy, this part if fun.....

 

Wow. So I shot low on hp goals?
Thanks for the heads up

Budget? Well. I figure exhaust alone will be atleast 1k

Heads I figure ill have 1300 stuck into them if I buy another set or ill say hell with
It and get afr or tfs. Always got good results
Intake will be 200
Cam will be custom. And my last cam was a tslr with 666 lift and 158 duration with a 109 lobe and that
Ran me 400 bucks.

So it looks like 5000 wil be my budget

I see mph heads. How much were they and do you recommend them for my
Goals

 

You also don't need valves that big to flow 265 CFM. Why overcomplicate things. Go with 2.00/1.56.

1-7/8" primaries will be too big. Reduces exhaust gas velocity, and reduces scavenging. Stick with 1-3/4" for that HP goal.

Not a lot to be gained by porting the LT1 intake manifold. Let the head porter do a minor touch-up, to match the heads.

 

im have heads done by Lloyd elliot and getting a cam done as soon as the money order arrives to him as long as a spring kit and rockers. you can literally ask him as many questions as you wont he has no problems with it or get irritated with you. or other people recommend advanced induction. LE does good hand porting and will match a custom cam to whatever the specs are on your head and AI does cnc machined. but AI is more expensive but you can get every last HP you can get out of them and for i think $300 extra will get a cam matched to them also.

a mailorder tune is what i did. i debated on PCMforless.com or Madtuner.com i went with madtuner and got the full/performance tune it cost me $250 but i will be getting $110 back when i send my PCM that is in my car to them.

 

How much do these stock heads done by
Your recommended port head builder cost?

1 7/8 are too big? I was considering those for a stroker 383

I'm gonna see how many go fast parts I can snag used so I can
Splurge on a rear end. Something is very sloppy
Back there.

I'm digging the 401hp somebody has here in my post

 

You can use my car as an example. I have a standard forged shortblock, the AI 200cc ported stock castings, a great dyno-tune plus all of the bolt-ons and put down the numbers in my sig. The heads were $2000 and the short-block was $3000. Add on top of that all of the bolt-ons and tuning and you're right around ~$6500+. Depends on how fast you want to go.

 

im pretty sure advanced induction is 1900 bucks for machine work and matching cam on a set of 643s or 374s that you provide them. and from what ive read results are typically 400+hp on stock bottom end. either lloyd elliot or ai they are both very reputable, depends on what you want to spend.

 

$1975 actually.

http://advancedinduction.com/AiProductsLT1.html

 

from lloyd they are $900 for le1, 1300 for le2

elliotportwork.com

 

that was off the top of my head, close enough. besides, its 1975+ shipping!

 

Sure. But many people claim you get what you pay for. But we won't go there.

 

interesting and i like what i see..

i think i'm going to stick with my head guy...he knows the downfalls and the geometry of these heads,and many of my ford guy's have used him. i seen some of his work and look
awesome...he's a private non advertised guy so i'm not going run into hype or be pushed into stuff that i won't need like some past buisness have done to me..

i'm sure ai is good to deal with and like what i see,but my budget might not fit into his price..

once i get exhaust off and put some nice headers on i'm gonna do a compression test..i was told from prior owner that at 170k or so the bottom end was rebuilt...?...if bottom end checks out i might be able to save some coin and get rid of rear end before i blow it up lol

 

ok i touched base with my friend who is doing my heads explained a few things to me.

his equipment is stingy tight...and said he already got me a set of heads and stock they flow 210cfm on his bench...but he can take them to another bench and they will flow about 3-4% higher than his..he get's alot of grief for this and has been advised to just add the 4% and be done with it..

moving on and i made a typo btw..he said 2.00/1.57 valves and his work the heads flow 270cfm on his bench..add the 4% and they flow 280cfm...either way 210cfm to 270cfm is a 120hp net and with proper valve train and cam this car should dyno mid 400's and trap in the 120mph range...so this car should give me what i want and still go anywhere..