Whats this Carb off of ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1fun71 · 07-16-2007, 06:49 PM

My guess is maybe late 50's f*** 312 Y block??? I really have no Idea.. any help would be great. Thanks! OH and its a Holley.

'68 longbed · 07-16-2007, 07:06 PM

looks a little like somthing I 've seen on old tractors....but I couldn't say with any certainty

70GMCer · 07-16-2007, 07:07 PM

Looks like a mid to late 50's 312 4 barrel that came on T-birds......

nplocoman · 07-16-2007, 08:57 PM

I believe it's a thermaloid rapalater valve for a bud light

1fun71 · 07-16-2007, 09:03 PM

you see I couldn't even begin to figure out the carb unless had atleast one beer

Livrat · 07-16-2007, 10:37 PM

That is commonly refered to as "The Toilet bowl" Holley.. it came on Ford ""Y" (272, 292, 312) blocks in 1954 - 1956

ChevLoRay · 07-16-2007, 10:54 PM

We called them "hat top Holley's". Seems I remember that some folks said they were prone to carb fires. I never had one of them, but they were thought to be a performance carb, at the time. Others said they're from the mid-50's, and they're right. My old '56 Merc had a Carter WCFB on it, and it was as trouble-free as they came. I remember folks with those Holleys fussing a bunch about them. But for those who need one for a resto, they're what counts.

There was a 255-horse 312 in '57 that had a Holley on it, but it was not that kind of Holley. That carb in the picture was used in '55 and '56, as I recall.

But I like the "thermaloid rapalater valve for a Bud Light" idea. Come to think of it, a Bud Light ain't too bad an idea...and I don't even need that valve to use one. It's a good thing, too, because if I had to have one, the BL's would be SOL.

**Bob B.** · 07-17-2007, 03:59 AM

Holley 4000 series. Affirmative on the old Ford Y-blocks. GMC used them too on 370 Olds V-8's in late-50's heavy duty trucks.

07-16-2007, 06:49 PM	#1
1fun71 Registered User Join Date: Jan 2007 Location: Kansas Posts: 119	Whats this Carb off of ??? My guess is maybe late 50's f*** 312 Y block??? I really have no Idea.. any help would be great. Thanks! OH and its a Holley.

07-16-2007, 07:06 PM	#2
'68 longbed Registered User Join Date: Jun 2007 Location: mississippi Posts: 181	Re: Whats this Carb off of ??? looks a little like somthing I 've seen on old tractors....but I couldn't say with any certainty

07-16-2007, 07:07 PM	#3
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Whats this Carb off of ??? Looks like a mid to late 50's 312 4 barrel that came on T-birds...... __________________ 1997 GMC Sierra Ext 1965 Mustang

07-16-2007, 08:57 PM	#4
nplocoman never finish start another Join Date: Mar 2007 Location: North Platte Nebraska Posts: 432	Re: Whats this Carb off of ??? I believe it's a thermaloid rapalater valve for a bud light

07-16-2007, 09:03 PM	#5
1fun71 Registered User Join Date: Jan 2007 Location: Kansas Posts: 119	Re: Whats this Carb off of ??? you see I couldn't even begin to figure out the carb unless had atleast one beer

07-16-2007, 10:37 PM	#6
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: Whats this Carb off of ??? That is commonly refered to as "The Toilet bowl" Holley.. it came on Ford ""Y" (272, 292, 312) blocks in 1954 - 1956

07-16-2007, 10:54 PM	#7
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Whats this Carb off of ??? We called them "hat top Holley's". Seems I remember that some folks said they were prone to carb fires. I never had one of them, but they were thought to be a performance carb, at the time. Others said they're from the mid-50's, and they're right. My old '56 Merc had a Carter WCFB on it, and it was as trouble-free as they came. I remember folks with those Holleys fussing a bunch about them. But for those who need one for a resto, they're what counts. There was a 255-horse 312 in '57 that had a Holley on it, but it was not that kind of Holley. That carb in the picture was used in '55 and '56, as I recall. But I like the "thermaloid rapalater valve for a Bud Light" idea. Come to think of it, a Bud Light ain't too bad an idea...and I don't even need that valve to use one. It's a good thing, too, because if I had to have one, the BL's would be SOL. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 07-16-2007 at 10:56 PM. Reason: Stupid stuff

07-17-2007, 03:59 AM	#8
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,369	Re: Whats this Carb off of ??? Holley 4000 series. Affirmative on the old Ford Y-blocks. GMC used them too on 370 Olds V-8's in late-50's heavy duty trucks. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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