Help me identify my Holley carb.
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Help me identify my Holley carb.
The only number I could find on it was on the main body and it was 6931.
This seems to indicate 750 cfm. The carb does have 2 metering blocks, so it is a double pumper and it has vacuum secondaries and no choke tower (and it appears that it came that way and the choke tower was not milled down. Does anyone know what carb this is?
I was thinking Holley 0-82750 - Holley 4150 HP Carburetors but the main body on that looks different
This seems to indicate 750 cfm. The carb does have 2 metering blocks, so it is a double pumper and it has vacuum secondaries and no choke tower (and it appears that it came that way and the choke tower was not milled down. Does anyone know what carb this is?
I was thinking Holley 0-82750 - Holley 4150 HP Carburetors but the main body on that looks different
Last edited by GrandSportC3; Jul 30, 2015 at 10:00 PM.
Cruising
Joined: May 2013
Posts: 12
Likes: 0
From: Overland Park KS
It is a vacuum secondary with two metering blocks, but not a double pumper. The secondary Excelerator pump would be on the rear bowl, on the bottom of the passenger side. Maybe you could find specific information on Holly's website or give them a call.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
What I find is that it probably is a part #R-6931A, which is a 4150-G, "1975 G.M.T.C. 427 engine California. Vehicle mfg.'s part #717724.
Someone must've sawn-off the choke tower !?
Looked-up in the Holley Carburetor Numerical Listing catalog.
Someone must've sawn-off the choke tower !?
Looked-up in the Holley Carburetor Numerical Listing catalog.
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
It's hard to determine what you have unless you measure the venturi and throttle plate diameters. And possibly disassemble the carb to get some casting numbers off of the metering plates. The choke horn usually has the LIST number on it which would identify it. But it appears to have been milled off. The 6391 number isn't what you are looking for. I've included a link just in case you want to tear it apart and do some deeper digging. Good luck. 
http://documents.holley.com/techlibr...al_listing.pdf
http://documents.holley.com/techlibr...al_listing.pdf
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Right.. didn't even look for the 2nd pump... I looked at the extra metering block and I'm so used to Holley carbs being double pumpers if they have that 2nd metering block..
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
It's hard to determine what you have unless you measure the venturi and throttle plate diameters. And possibly disassemble the carb to get some casting numbers off of the metering plates. The choke horn usually has the LIST number on it which would identify it. But it appears to have been milled off. The 6391 number isn't what you are looking for. I've included a link just in case you want to tear it apart and do some deeper digging. Good luck.
http://documents.holley.com/techlibr...al_listing.pdf
http://documents.holley.com/techlibr...al_listing.pdf
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Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
It looks like a 3310 someone converted to use a rear metering block (Holley use to sell a kit to do this) and then milled the choke tower off.
The venturi size and straight boosters are a dead give away it started life as a 3310 750... plus the casting date looks like 1990 on the main body.
Why someone would put so much work in to such a modest carb is beyond me but maybe they just wanted to piddle.
Will
The venturi size and straight boosters are a dead give away it started life as a 3310 750... plus the casting date looks like 1990 on the main body.
Why someone would put so much work in to such a modest carb is beyond me but maybe they just wanted to piddle.
Will
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
It looks like a 3310 someone converted to use a rear metering block (Holley use to sell a kit to do this) and then milled the choke tower off.
The venturi size and straight boosters are a dead give away it started life as a 3310 750... plus the casting date looks like 1990 on the main body.
Why someone would put so much work in to such a modest carb is beyond me but maybe they just wanted to piddle.
Will
The venturi size and straight boosters are a dead give away it started life as a 3310 750... plus the casting date looks like 1990 on the main body.
Why someone would put so much work in to such a modest carb is beyond me but maybe they just wanted to piddle.
Will