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Topic: Holley R6931B Carb

in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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Holley R6931B Carb

Posted: 1/26/05 5:50pm Message 1 of 11
tricer
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SEVERN, MD - USA
Joined: 9/30/2002
Posts: 453
Vette(s): 1970 LT-1 Convertible Bridgehampton Blue Metallic 1999 Convertible Nassau Blue Metallic
My LT-1 had a Holley R6931B 4-barrel carb on it, before I started restoring it. Anybody know anything about this carb? What engine, car manufacturer, etc???
|headscratch| |headscratch| |frown|

Thanks


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Holley R6931B Carb

Posted: 1/26/05 6:41pm Message 2 of 11
anips
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sonoma, CA - USA
Joined: 8/9/2002
Posts: 784
Vette(s): 72 LT-1 AC coupe,69 l-36 coupe
Don't know yet, but your LT-1 should have either a R4489A-3972123 or a R4555A-3972121


Holley R6931B Carb

Posted: 1/27/05 6:25am Message 3 of 11
tricer
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SEVERN, MD - USA
Joined: 9/30/2002
Posts: 453
Vette(s): 1970 LT-1 Convertible Bridgehampton Blue Metallic 1999 Convertible Nassau Blue Metallic
I replaced the R6931B with a R4555A which improved the performance - only to find out it was a CA car, and needed a R4489A. Got the last one on order. Just trying to figure out what to do with the R6931B.
|headscratch| |eek|


Holley R6931B Carb

Posted: 1/27/05 3:09pm Message 4 of 11
anips
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sonoma, CA - USA
Joined: 8/9/2002
Posts: 784
Vette(s): 72 LT-1 AC coupe,69 l-36 coupe
does it look like your LT-1 carb, devorse choke,vac. sec., might be LT-1-302 Z-28 Camaro, any real perf. auto parts can tell you by the #'s out of the Holley cat., keep it for parts.

|UPDATED|1/27/2005 3:09:56 PM (AZT)|/UPDATED|



Holley R6931B Carb

Posted: 1/31/05 9:51am Message 5 of 11
After Shark
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Portland, TN - USA
Joined: 4/29/2003
Posts: 805
Vette(s): 1972 Coupe Anything, but Stock and more mods to come! SSBC Force 10 Brakes, 3.73, TH350, 355 CID, Rack and Pinion, Vette Brakes suspension front and rear.

Well I don't show a R6931B in my Holley Carb List book.  Only a 6931A.  it says its for a 1975 G.M.T.C. 427 engine. California.

Vehicle Mft Part No 717724

 




Holley R6931B Carb

Posted: 1/31/05 10:00am Message 6 of 11
SWestLT1
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Joined: 10/20/2004
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On my 72 LT1 the original carb is part# 65-6239, a 780 cfm Holley.  I got tired on visiting the gas stations and downsized it to a Holley 650cfm part #4777C which runs great




Holley R6931B Carb

Posted: 1/31/05 8:23pm Message 7 of 11
tricer
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SEVERN, MD - USA
Joined: 9/30/2002
Posts: 453
Vette(s): 1970 LT-1 Convertible Bridgehampton Blue Metallic 1999 Convertible Nassau Blue Metallic
After Shark,

What's "G.M.T.C."?? You say a 427 - could it be a Camaro, as ANIPS said earlier?




Holley R6931B Carb

Posted: 2/1/05 11:26am Message 8 of 11
After Shark
Former Member
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Portland, TN - USA
Joined: 4/29/2003
Posts: 805
Vette(s): 1972 Coupe Anything, but Stock and more mods to come! SSBC Force 10 Brakes, 3.73, TH350, 355 CID, Rack and Pinion, Vette Brakes suspension front and rear.
I really don't know what GMTC stands for.  Book was written many years ago and there is nothing in the book that tells.  Sorry, but I don't think it would be a camaro.  To my knowledge a 427 was never offered in that body.


Holley R6931B Carb

Posted: 2/4/05 5:50am Message 9 of 11
tricer
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SEVERN, MD - USA
Joined: 9/30/2002
Posts: 453
Vette(s): 1970 LT-1 Convertible Bridgehampton Blue Metallic 1999 Convertible Nassau Blue Metallic
After Shark,

Any more details on the R6931B? Double feed? Double pumper? 750CFM? 780CFM? 850CFM? Any additional info will help when I decide what to do with it.

Thanks,


Holley R6931B Carb

Posted: 2/4/05 8:55am Message 10 of 11
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

[QUOTE=After Shark]I really don't know what GMTC stands for.  Book was written many years ago and there is nothing in the book that tells.  Sorry, but I don't think it would be a camaro.  To my knowledge a 427 was never offered in that body.[/QUOTE]

the only 427's used in 1975 to my knowledge were tall deck truck blocks...

maybe gmtc = gm truck cali

cthulhu38387.3723611111


in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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