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Old 05-21-2004, 06:24 AM
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proform carb bodie

I ordered one of these Carb Main bodies. Has anyone had any experience with the results. They claim 25 to 50 hp increase. I remember reading in Summit Tech section that they recommend this as a viable improvement in performance.




PROFORM® Carburetor Main Body

Part No. 67100C

Direct Replacement Carburetor Main Body: Component for use on Holley® 650 CFM (#4777), 700 CFM (#4778), 750 CFM (#4779) and 800 CFM (#4780) Double Pumper® with Mechanical Secondary. Get that extra performance out of your ride in less than 30 minutes! Add up to 25-50 HP with PROFORM'S 100% NEW high-performance carburetor main body. Easy swap-in, swap-out installation utilizing existing metering blocks, fuel bowls, and base plate. Involves only 14 screws. Comes in Clamshell package with instructions, all necessary non-stick replacement gaskets and high-performance jet kit. Flows 750+ CFM, adjustable screw-in air bleeds, high-performance down-leg boosters. Get maximum air flow with no air horn, choke tower, or choke control.

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Old 05-21-2004, 07:55 AM
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Work great.

Chris
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Old 05-21-2004, 11:58 AM
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Chris, did you notice a substantial increase in performance?
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Old 05-21-2004, 12:21 PM
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A buddy of mine just tried one out. He is quite adept at tuning and adusting carbs. He had to send it back 'cause he couldn't get it to work at all.


tom
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Old 05-29-2004, 08:51 AM
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I Installed mine and seems to work Ok so far. I need to lean out the primary side as I installed the 74 jets they provided. A bit too much fuel. I will try 72's and see how that works out. Idle seems good and WOT seems great! Just a bit of tuning and I think it will work out great!
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Old 05-29-2004, 10:24 AM
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My whole theory on street driven cars with carbs is that chokes make life a lot easier. Sure you can mill the choke shroud off of a Holley or buy a Proform center section. They will flow more air. But why not just get the next size larger carb and keep the choke?

I just jump in my car no matter how cold it is, step on the pedal once, turn the key, and drive away. It runs as good as if it were already warm. It sure beats the chokless method.
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Old 05-29-2004, 02:28 PM
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Ive been considering the pro form kit as well. However the car I want to put it on would be my daily driver. I also live in Houston, where the temperature doens't get too cold. So I'm 50/50 about the choke situation.... Currently I leave my choke all the way open and have it stuck there... never seem to have any problems.... anyone else have an opinion/pros and cons?
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Old 05-29-2004, 04:41 PM
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I live in California. The temperature where I am really doesn't cahnge much throughout the year. Still, the addition of a choke makes a huge difference. With a choke you can start it and go.
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Old 05-29-2004, 05:39 PM
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Almost all the feed back I've seen has been positive on the Proform main bodies. People report improved et & mph. I've seen one or two reports of tuning issues but I think they got them straigtened out.

The tuning can be a little tricky sometimes.

The guys at www.quickfueltechnology.com can be a big help with problems. They are the ones that build the Proform race carbs.

I've talked with Marty Brown and he's a very helpful & patient guy.

I think you'd be happy with the results if you're looking to optimize performance.
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