Could anyone tell me what kind of horsepower I can expect to get from this setup on an '84 corvette? An Edelbrock Performer RPM cam (Int.234 Exh.244 duration, Int.488 Exh.510 Lift), a Holley 650 cfm carb and intake, 350 horse .041 heads, hedman hedders, high flow cat., flowmaster mufflers. OH! and before I forget, when I convert to a carb what am I going to do about the fuel pump, I hear that a carb only needs 7-8 psi and the CFI oump makes 9-11, so do I replace the fuel pump or what, and what can I do about the TV cable, I don't believe that there is anywhere to hook it on the intake. Anyway, if find the time just let me know.

 

You can solve the fuel pressure problem by putting your regulator ahead of the carb and manually adjusting it to 8psi. I don't see why that wouldn't work... And do you mean 0.041 head gasket thickness? If so, going to recycle the stock cylinder heads?

Can't help you with the TV cable though. Do a search, I know several have swapped to carbs and they may have fabricated their own attatchments...

Good luck with the swap- I'm going TPI myself.

:thumbs:

 

That sounds like a good cam for street/strip performance. What are your plans for this car? Matched with intake and the heads, I'd think you'd be around 300hp... Best thing to do would be to schedule a dyno visit after your buildup for the best tune.

What type of intake or you thinking of switching too?
Putting in a fule pressure regulator would let you reduce the pressure for the carb.

Check your local emissions laws too- if your planning on making this your daily driver you need to make sure it will still pass an emissions test...

 

Try Lokar for the throttle cable.

 

Sounds Ok, except the cam is a little large. You might be happier with something in the 210 to 220 range on the intake...about 6 to 10 more on the exhaust. I'd check the hood to air cleaner measurement too. Good luck!

:chevy

 

The emission laws in my area are, well, I don't know, but I do know that in all the years I've seen cars inspected they never opened the hood to check anything, all they did was check the turn signals, the horn, the headlights, the back up lights, and once in a blue moon they would check the catalytic converter. I've seen other guys I know get their cars inspected with no emissions at all on them and pass so maybe I'll be allright. I've gotta check the hood though to see if it will still close. The intake is a holley, and it should match the heads. I do have another question though, is it possible to delete that smog pump? If so, then what about the belt, there won't be any pulley there for it to turn? I've noticed that TPI equipped cars don't seem to have the smog pump, so could I just use a TPI belt instead? Just let me know when you get the chance? Thanks.

 

That is a big cam for a 350.

 

Yep, too much cam.

I'm gonna guess about 325 if you keep the compression up on it.
Your aircleaner is going to have to stick through the hood.
I'm also going to guess your CAT is going to be short lived behind that carbed engine.




[Modified by VetNutJim, 4:38 PM 5/15/2003]

 

Not if the carb is tuned well, cat's came out in the 74 model year and the last carb's were on the 88 GM trucks there were alot of car's in between. The cam is a bit much you'd really have to spin 350ci up to put the engine into its powerband. I'd try somewhere around 220deg. What ever you decide, Have fun!!!!! :thumbs:

 

There's never been a carb that was "tuned" well.
Not for more than one day, anyway. Maybe a half a day. Maybe an hour depending on atmospheric conditions.

Every time the temperature changes the carb is out of tune.
Every time the baro. pressure changes the carb is out of tune.
Every time the altitude changes the carb is out of tune.
Every time the phase of the moon changes a carb is out of tune!

They are never "right" from low throttle to high and all areas in between.
The float lever constantly changes with g forces. Just normal stopping, starting and turning affects them.

A carb is a compromise. No doubt about it.
A 650 Holley is not even an ECM controlled carb.
BTW I've changed many a power valve and jet in Holley carbs.
I have rebuilt many a Carter AFB and a barrel full of QJets.
I've adjusted many a "pump shot" back in "my day".
And I've burned many a finger pulling plugs and "tuning" carbs.

Frankly, I'm glad they are just about gone. The darn things were always a rudimentary form of engine control.... always a compromise.
Heck,I can MAKE you a carb with a bottle of gas and a straw.
That's about how sophisticated they are.

But to each his own. If you like'em it's ok with me.
I'll stick with fuel injection and computers.

 

Re: TC Cable.


There are adapters available to attach the TV cable to your carb. Check with Holley.
You will HAVE to have the TV cable connected if you don't want to kill your tranny.
You may have to fabricate a bracket for the TV cable but that shouldn't be too difficult.

 

Alright guys, the summit catalog says the cam pulls from 1500 rpm to 6500rpm, so that seems like the way to go, tell me, do you think I'll need a stall converter with this cam, and will my car lope and idle erratically with this cam? Big question, is there anyway possible I can put the carb on and still be able to close my hood, without having to make a hole in it? All I can say about fuel injection is this, they are a good way to have good gas mileage, and a fair way to make power, I've heard that the cross fire and the TPI were both designed for a 305, so therefore I guess that means not only do they have a 40% smaller intake, but they also have 305 heads, I do not entirely understand how you can remedy these hp killers, but if you want to tell me thats fine. As for computers, I would like to curse the day they were made (for cars at least), if one impossible to get to sensor goes bad then the whole car craps up, and to find the problem you have to put it on another computer, and not many people have those at home, and wind up with a costly repair bill. Although I would install an LT-1 engine in my car or an LT-4, or LT-5, or LS-1, or LS-6 in my car but I can't afford any of them so I'm pretty much rebuilding and going carb. Anyway I'll talk to you later.

P.S. Those heads I told you about are .202 intake

 

Try to find Yoslambo. He has an '84 with a Carb setup and I know his hood clears.

 

Alright Thanks.

 

IF your cam is good at 1500 RPM, you won't need a higher stall speed converter.
Your stock converter is somewhere from 1500 to 2000 stall so you should be ok if the cam is "coming in" at 1500.

That's a pretty broad range for a cam..... 1500 to 6500

 

I have done this conversion so a couple of things, 1. you can get a TV made easy kit from Bowtie Overdrives at http://www.700r4.com ( this kit will alow you to properly set up the TV cable for your carb) 2. You need to swap your distributor to a non CPU controled one. 3. you will need to do some wiring such as jumpering +12v ingnision to your fuel pump 4. you will als need a kit to control convereter lock up again you can get this from Bowtie. 5. You will probably need to remove your air pump because it hits most after market manifolds and without the crossfire manifolds mounting points its a real PIA. 6 I used a T fitting and 2 fuel preashure regulaters to set my fuel preshure up at 7 psi one regulator was going to the return and one to the carb. For whats its worh This was the single best performance mod I ever made to my motor, for around $300 it was well worth it. But now it is time for my LT1 to go in I am getting the intake powder coated then its ready to drop in,

 

You are just up the road from me. When you get it together I'll meet you at the Kinston strip. I ran a regulator on my BB:


I'd go for the barry grant over the Holley carb. Easier to tune and looks better too :)

 

For what it's worth, there are LT1s and LS1s in good shape on ebay all the time for $1500 or so? Add a wiring harness & ecm and you are set (well, more or less).

As for deleting the smog pump: remove it completely and use a 6 rib 85 inch belt instead.

 

234/244 @.05 is way to big for your car. I think you will be disappoint with the idle quality. Very loppy idle. remember you are only a 350ci. You should go something like 220/230 duration is much better suit a 350ci motor. check out comp Cams. they have a lot of cams to choose from.


Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads







[Modified by Bruce, 8:42 PM 5/17/2003]

 

I hear you. About the cam, well I don't know what it'll do, but I'm going to try it, and by the way, they make bigger cams than that for 350's, you just need a stall converter to make it work properly. I'll talk to you later.

P.S. tworottiedogs, I'll look you up when I get it together.


[Modified by drpepperkid, 12:27 AM 5/19/2003]