'72 Rochester Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stllookn · 01-11-2007, 12:59 PM

I have reebuilt a few of these but have not seen one like this with the in-line fuel inlet and the funky vacuum port on top (maybe it just goes directly into the air cleaner). The number (7042272) indicates it is a '72 400-455 Pontiac carb. I can't find any info about the big vaccum port. I don't want to rebuild it if I can't use it. Anyone have some experience with this beast?

sneakysnake · 01-11-2007, 02:43 PM

Heres what "Google" had to say.LOL
http://www.scgg.com/carbs.html#I0
http://www.carburetor.ca/carbs/kits/CK104.htm
http://members.shaw.ca/crussel/quadr...ing_Paper.html
http://www.carburetor.ca/carbs/tech/...jet-index.html

woodridge · 01-11-2007, 03:26 PM

I don't remember the #'s but some of the pontiac carbs where rated at 850cfm. Would be a plus if you are into the ptm sysndrome. If not some of the pontiac guy's would gladly take it off your hands.

**WorkinLonghorn** · 01-11-2007, 03:56 PM

http://www.tocmp.com/manuals/Carbs/R...73_4M_0001.htm
http://www.tocmp.com/manuals/Carbs/R...QJet/index.htm
Last link is the full manual.Don't know if it explains that verticle tube.

01-11-2007, 12:59 PM	#1
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	'72 Rochester Help I have reebuilt a few of these but have not seen one like this with the in-line fuel inlet and the funky vacuum port on top (maybe it just goes directly into the air cleaner). The number (7042272) indicates it is a '72 400-455 Pontiac carb. I can't find any info about the big vaccum port. I don't want to rebuild it if I can't use it. Anyone have some experience with this beast? Attached Images __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

01-11-2007, 02:43 PM	#2
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: '72 Rochester Help Heres what "Google" had to say.LOL http://www.scgg.com/carbs.html#I0 http://www.carburetor.ca/carbs/kits/CK104.htm http://members.shaw.ca/crussel/quadr...ing_Paper.html http://www.carburetor.ca/carbs/tech/...jet-index.html

01-11-2007, 03:26 PM	#3
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	Re: '72 Rochester Help I don't remember the #'s but some of the pontiac carbs where rated at 850cfm. Would be a plus if you are into the ptm sysndrome. If not some of the pontiac guy's would gladly take it off your hands. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet

01-11-2007, 03:56 PM	#4
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,865	Re: '72 Rochester Help http://www.tocmp.com/manuals/Carbs/R...73_4M_0001.htm http://www.tocmp.com/manuals/Carbs/R...QJet/index.htm Last link is the full manual.Don't know if it explains that verticle tube. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. Last edited by WorkinLonghorn; 01-11-2007 at 03:59 PM.

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