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Old 09-09-2003, 03:42 PM   #1 (permalink)
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Hi Folks,

I have searched through the archives and have seen enough info that says that a 750 CFM carb on a 347 stroker that will max out at 6000 RPM is probably too much. However, I have a 347 that came with a 750 CFM carb. I am trying to find out if anyone is running a setup similar to this successfully. Here is an email I sent to Edelbrock to give you a little more background. I just sent it off and have not received a reply back yet:
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I just purchased a used motor with a lot of Edelbrock components on it. It is a Ford 302 stroked to a 347. It has Performer RPM heads, an RPM Ari-Gap intake, a Performer like cam (the Summit cam with the same numbers), and a 750 CFM Edelbrock carb with electric choke. The engine has low miles and the spark plugs (which were not long reach plugs and were partly shrouded) were really black with carbon. The pistons seemed to have a lot of carbon on them too, which I noticed when I was trying to find TDC for the engine.

My question is, is this carb too big for this engine? My application is a 1971 Ford Torino Convertible. This is a daily driver. I am not going to be getting over 6000 RPM. If the carb is not too big, do you have a setup/configuration for the carb that would be a good starting point for this engine. I am not sure if the carb is setup differently that it was out of the box. If this carb is just too big, which size Edelbrock carb do you recommend?
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Thanks!
Ted.
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Old 09-09-2003, 03:55 PM   #2 (permalink)
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My BOSS is a Stroked BOSS 302 to a 345. .020 over I run the stock 780cfm Holley with no problems. Even had to jet it up a bit from stock.
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Old 09-09-2003, 04:06 PM   #3 (permalink)
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It will probably be OK if the carb has vacuum secondaries.
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Old 09-09-2003, 04:13 PM   #4 (permalink)
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you'll be fine .. anything from 600cfm - 850cfm on a heavy breathing 302/347 can be modified to work well/right.
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Old 09-09-2003, 04:19 PM   #5 (permalink)
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The 750 is an OK size for that motor - just needs some tuning... perfect for a weekend warrior.

HOWEVER, since you plan to daily drive that in a relatively heavy Torino convertible, I'd switch to the Model 1406 600 cfm carb. Smaller venturis for better flow velocity, fuel atomization, and efficiency at the lower RPM's in which your motor will primarily be used.
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Old 09-09-2003, 04:35 PM   #6 (permalink)
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I had a holley 750 dp on my 347 originally and we could never get it to not run rich. I switched to a holley 650 dp and with just adjusting it (no modifying yet) it works perfectly.

My motor:
347 roller
cam .493/.510 279/289
Weiand Stealth
Trick Flow Twisted Wedge heads (no port/polish work doen yet)

Dyno with this setup 338.9 rwhp, 335.5 rwtq
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Old 09-09-2003, 08:11 PM   #7 (permalink)
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Hi Guys,

Thanks for all your input. I probably will not hear back from Edelbrock for a day or two, but I will post their response here too.

I think I will fish around a bit and see if I can find anyone who wants to buy it. I see there is one for sale for the same reason right now in the Engine and Drivetrain parts section! Maybe I will PM 71Mach351 and see how many takers he gets. Otherwise, I will at least use it to get the car going and see what happens.

Thanks,
Ted
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Old 09-09-2003, 10:32 PM   #8 (permalink)
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The Fastback has a 750 on it (Super Victor intake) and it performs with no problems. However, it is geared low (4:11s), is a light car, and turns 6500+ rpms. It has run 12.8 @ 112mph in street trim with no special setups for the strip. The only problem is traction in 1st gear, resulting in fairly long 60' times.
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Old 09-09-2003, 10:53 PM   #9 (permalink)
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I've heard that 750 edlebrocks for some reason are horrible POS go with something a little bit smaller or maybe something a different brand.
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Old 09-10-2003, 11:46 AM   #10 (permalink)
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Can you point me to any links on the VMF about this. I am interested in what types of problems people have had.

Thanks,
Ted.
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Old 09-11-2003, 03:46 PM   #11 (permalink)
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Here is the reponse I received from Edelbrock tech support:

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I assume you don't have an owner's manual, so I've attached one for your reference. You'll need Adobe Reader/ Acrobat to open the file. If you do not have this, you can download it for free from www.adobe.com

Please check the float levels. The needles and seats should also be clean. Make sure the fuel pressure is between 5 and 6 psi at the carb.

Start up the motor with a new set of plugs. After a few miles, pull the plugs -are they still sooty and black? If so, I can help recommend some jets and rods. Do you live at elevation?

------------------------------------------------------------

Hopefully I am going to start it up this weekend.

Ted.
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