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Old 06-24-2009, 08:02 AM
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Holley AED/Proform 850

I've got my 355 running!

This is in 70 Nova that I'm going to make a 20%street / 80% strip (1/8 mile) car out of.

Current 355:
Flat Top forged pistons
SCAT Crank
5.7 H Beam Rods
Victor Jr intake
MSD 6AL
Holley 750 DP
Pretty Weak Hydraulic Cam - Now Comp Cams- XTREME ENERGY 12-679-5 cam
Pretty Weak Factory heads - Now DART PRO1's 200cc.
4500 Stall Converter
Power Glide with trans brake
4.56 Gears

I'm also in the process of building a 383..

Found a carb that I'm looking at doing some trading with.
850 AED HOLLEY DOUBLE PUMPER WITH PROFORM CENTER SECTION (the guy stripped out the original AED) AND JET EXTENSIONS .078 JETS.

Your thoughts -
Is this a good carb?
Too big?

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Old 06-24-2009, 08:16 AM
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Well with your converter and gear as shown I would think you are going to be thrashing thie thing, and IMO it is not too big. Bigger Q's to think about... what are you trading up? Is the center section the right one for the rest of the deal? Sometimes people swap and change things out that just aren't right. Are you sure this carb is worth the swap? What price or value is your trade? It's hard to say if it's a 'good carb' or not given your description. Whenever looking at used or assembled from parts carbs it would be nice to know/see if it actually works on a running engine.
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Old 06-24-2009, 08:32 AM
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Good questions

Quote:
Originally Posted by Deez
Well with your converter and gear as shown I would think you are going to be thrashing thie thing, and IMO it is not too big. Bigger Q's to think about... what are you trading up? Is the center section the right one for the rest of the deal? Sometimes people swap and change things out that just aren't right. Are you sure this carb is worth the swap? What price or value is your trade? It's hard to say if it's a 'good carb' or not given your description. Whenever looking at used or assembled from parts carbs it would be nice to know/see if it actually works on a running engine.
The carb I'm trading is your standard 750 Holley DP and I'm giving $150. The guy has offered to put it on his car and run it.

I don't know anything about the proform center sections. Are they any good?
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Old 06-24-2009, 08:58 AM
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I have the 750 proform center section on a 700dp and it works very well.

Make sure which center body you have. 750, 850, 950. and which throttle plate you have. 1-11/16" 1-3/4" If you ahve a mismatch of parts, it won;t work well without a lot of fiddleing with the fuel curve tune.
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Old 06-24-2009, 09:01 AM
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Clear me up

Quote:
Originally Posted by F-BIRD'88
I have the 750 proform center section on a 700dp and it works very well.

Make sure which center body you have. 750, 850, 950. and which throttle plate you have. 1-11/16" 1-3/4" If you ahve a mismatch of parts, it won;t work well without a lot of fiddleing with the fuel curve tune.

So I should measure the center body throat diameter and compare it to the throttle plate and they both should measure the same.
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Old 06-24-2009, 09:01 AM
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For less than $150 you can buy a new Proform 750 center body and upgrade your present standard 750DP.
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Old 06-24-2009, 09:05 AM
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Quote:
Originally Posted by eric866121
So I should measure the center body throat diameter and compare it to the throttle plate and they both should measure the same.

Thats not what I said. If the various carb parts have been swapped around eg: a 850 dp body on a 950 base or 750 body on a 850 throttle base, the fuel curve will need adjustment. (metering blocks) This may be why its being offered for sale/trade.

Seriously consider working with your own 750 (with a new proform 750 center).
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Old 06-24-2009, 10:31 AM
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?

Quote:
Originally Posted by F-BIRD'88
Thats not what I said. If the various carb parts have been swapped around eg: a 850 dp body on a 950 base or 750 body on a 850 throttle base, the fuel curve will need adjustment. (metering blocks) This may be why its being offered for sale/trade.

Seriously consider working with your own 750 (with a new proform 750 center).

I found the part number for the proform 850 center body - 67107c. Do you know if proform stamps their # anywhere on their main body?
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