autos don't have to worry if their not spraying... i've painted the road in front of my 20' at a time.. 2 matching stips... paradas have a weird skid mark.. 7" wide.. 1/2" nothing than another 2" same on the other side...

and I say I should be higher considering I have the crane 2030 cam and ported heads and intake and IRM dual exhaust, hollow cat and a K&N air filter...

With all that to improve breathing, you've gotta be getting some more HP.

For those of you who have non-stock heads... did you have the stock ones rebuilt or did you buy a set of already finished performance heads? Details please!!

I'm running a 3.1L, not the 3.4- But I had my stock heads port & polished, as well as porting the stock exhuast manifold, plus a ported TB & Intake Plenum. The heads were also machined down a touch to perfect the plane- probably bumping up the compression just a touch. Next I had a high-flow CAT installed and ditched to muffler, replaced by Monza Baffle Tips. I've never dynoed the system, but I've driven my car in comparison to my Dad's stock 88GT- and there is definitely a huge difference! I'm trying to at least get ahold of a G-Tech Pro...

I ported and polished my Gen III heads. Not that it is difficult...aluminum is so easy to work with Couple of other tricks too.

Shaun the camshaft specifications I gave are for the stock Camaro motor and not the GM 3.4 crate engine. The GM crate engine comes with the 12363220 camshaft or the same one I have.

I always thought the lower and middle intake manifolds for the 93-95 Camaro 3.4-liter engines had the same size length and width intake runners. Consider that the heads are the same iron heads too. I remember looking at them side by side. The Top intake manifold is of course different but the throttle body is the same size as the fiero I believe. Correct me if I’m wrong! The only major difference between the fiero lower manifold and the Camaro lower manifold are that the Camaro lower manifold has no prevision for a cold start injector.

The 3.4 Crate engine was designed so that you could take the very restrictive two-barrel carburetor, intake, and exhaust system and bolt it up to it and still have decent power. I would imagine that those induction and exhaust systems are much more restrictive than the Camaro SFI injection system. I think the 2.8-liter engine made 110 horsepower in the S-10 or something close to that. If the GM 3.4 crate engine can make 160 horsepower with those restrictive induction and exhaust systems than I would imagine that the horsepower would be higher with the fiero intake and exhaust system.

With a lesser 106-lobe separation angle the power curve tends to build more slowly and is usually more spread out over the RPM band, less peaky. With a lobe separation angle like 112 the power builds quickly peaks and then drops off quicker.

Here is what the 3.4-liter engine looks like with a Crane 2030 camshaft in it.

RPM horsepower torque
2000 74.997795 196.869217
2500 96.718681 203.109238
3000 121.023163 211.790543
3500 140.326431 210.489655
4000 154.726410 203.078415
4500 163.071762 190.250397
5000 163.495880 171.670685
5500 154.616913 147.588867
6000 137.664291 120.456253
6500 115.910690 93.620178

Here is what the stock Camaro 3.4 motor looks like in comparison.

RPM horsepower torque
2000 74.839790 196.454453
2500 94.390236 198.219498
3000 117.973602 206.453812
3500 136.811050 205.216568
4000 150.910355 198.069839
4500 159.495956 186.078613
5000 162.414505 170.535233
5500 158.986481 151.759811
6000 148.987030 130.363663
6500 131.952957 106.577393

The Crane 2030 camshaft doesn’t make as much top end horsepower as the stock Camaro camshaft does but it makes more mid ranged torque and horsepower.

Here is what my dyno program says the GM crate 3.4-liter engine looks like with the GM 12363220 camshaft. I used a 350 cfm two barrel carburetor, Dual plane intake manifold, and the stock factory restrictive exhaust manifolds and mufflers.

RPM horsepower torque
2000 61.796532 162.215897
2500 81.345230 170.824997
3000 106.059952 185.604919
3500 127.329697 190.994537
4000 144.120575 189.158249
4500 156.293701 182.342651
5000 161.198608 169.258545
5500 155.791855 148.710419
6000 143.997711 125.997993
6500 122.911919 99.275009

[This message has been edited by 88formula (edited 10-19-2001).]

So the stock camaro cam makes the most top-end HP!!!!!!!!

Good, now I can save $150...

Looks like a 5 hp gain but much more when you measure under the curve from 3000-5500!!!

I'll have to dyno my car again when I get it back!!!!

Lou

Lou just noticed you live in Massachusetts too. What are you doing to your fiero/motor?

Thanks for the numbers 88Formula. Kind of funny how a cam with more lift and duration doesn't give anymore power but hey thats the way it works sometimes right?

just to make a point the 2.8 s-10 motor also had smaller valves if I am not mistaken.

I am unsure about the 3.4 camaro motor having a larger TB or not. I have never seen them side by side to compare. I was aware about the lack of a cold start injector on the camaro lower manfifold. I have never looked at a camaro lower or upper intake but in pics it definately looks like the camaro has more plenum volume then the Fiero intake. Also from pics it looks like the runners are larger but yes since the intake ports on the heads are the same size as the Fiero ports then most likely they are the same as diameter intake runners too. However the fiero runners might be longer for more low end torque however I have never measured this nor do I know anyone that has the intakes so I can compare and measure. Perhaps someone here can help out and let us all know.

I also seems to me but I could be wrong that a carberator will breath better up top then a tuned port system with longer runners. Am I wrong?

I say everyone with a 3.4 get Cooter to build them a Dual TB setup to unlock that hidden power from the 3.4 and let that thing breath up top. What do you say Cooter? I hope I am not getting you into a bunch of trouble

------------------
Shaun 85 GT with nitrous
0-60 in 5.6 seconds
Shaun41178@hotmail.com
**** FOREVER!

The carb. will definitely make more top end then the fiero FI.

The fuel injection is hands down better starting cold weather.

88Formula

I had an Ed Parks 3.4 rebuild w/ crane 2030 cam but a retainer broke and a valve fell into the combustion chamber and blew a piston, bent a rod and wrecked the head and block.

So I'm getting a used camaro 3.4 and I was contemplating a cam change but not anymore. I need to get a head ported of the block I'm buying and matched to my good head.

Should be done in a couple of weeks. Do you wanna compare 3.4's when I'm done?

Don't you have a V8 also? or a turbo v6?
I may be getting a turbo out of a TB coupe soon...

Yes I do! Would like to see someone else with a 3.4 for a change. Maybe we could meet at epping?

If you want someone to rebuild those heads for you and give them a performance valve job than I recommend ABT machine in Hopkinton MA. They are excellent! Ray Paulk recommends them too. They backcut my valves for more low lift flow. You may want to do the same to your heads.

I have a set of old 3.4 heads with about 75k miles on them.

[This message has been edited by 88formula (edited 10-21-2001).]

What/where's epping?

I'm just under an hour from Hopkinton. I used to have a girlfriend in Milford.

I should be OK with getting the work done.
I'm going to try to save for Ed's 4.9 kit for the summer to go into my 88 but I hope somebody has an aluminum flywheel for the 4.9 by then. Cut the torque and bump the HP!

Other than the starter mounting, what else needs doing to install the 3.4 pushrod? I have the 3 spd auto, and I think I read somewhere that you have to shave/grind down the block somewhere so it fits to the transmission properly, is that true?
I may switch from auto to 5-spd if I can find a good 5-spd parts car around here fairly cheap. Does the 4cyl Isuzu 5-spd work on a 3.4, or can it not handle the power?

I meant New England Dragway in Epping New Hampshire. I’ve only been up there once but I have never actually race a car at a track before. I want to bring my car up there before it gets too cold, maybe this week.

Just replaced the old crappy 3.4 injectors with my blueprinted 2.8 injectors and the thing runs great now. I made an adjustable fuel pressure regulator to turn the fuel pressure up since the car wouldn’t run at 40 psi. It still needs a lot of tuning though. A custom prom chip may be in the works.

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what all do you have to do to toon. i though you just move the starter and bolt it up, use the 3.4 injectors and go. i didn't think you had to toon it or get a new prom.

88formula, you may have another problem. My 3.4 with 2.8 injectors runs with idle fuel psi from 34 and up.

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Alex4mula
:) Red-Original Owner & White-1/94 with PM (:

Maybe the fuel pump isn't flowing the necessary volume required for the engine but it produces enough pressure! I don't know. My engine is not a stock 3.4 either although I doubt it can flow that much more air than stock engine. When I had the 3.4 injectors it was running too rich with the idle fuel pressure at a stock 34-psi. So much so that the BLM was 120 and the integrator would go down to between 20 and 70 at idle.

My 2.8 injectors have been blueprinted by Marren Motorsports so I know they are not clogged. My 3.4 injectors are some old ones a friend gave me with around 75k miles.

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That's weird. I have read about your mods but I think they are not enough to get lean. My 2.8 injectors were also blueprinted by Marren. I installed an A/F ratio and everything seems fine regarding that. I have stock cam and heads but the rest all the way up to the TBS is ported and have FOCOA headers. Are you running the stock ROM?