quadrajet id
Thread Starter
Instructor
Joined: Jan 2012
Posts: 215
Likes: 6
From: Mebane, NC
quadrajet id
I have no idea where this carb came from. 73 coupe, early 80s crate engine. electric choke. PO did a terrible job of painting the engine. A future project for me. Took pictures of all the markings I could find. Hopefully they will be clear enough to help.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
The side that will tell the whole story.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
Maybe it is 17084268 ??
1708 = built in the 1980's
4 = exact year of mfgr. 1984
2 = 4bbl, federal emissions standards
8 = ? (0,1,2, chevrolet/4, buick/5, Oldsmobile/6,7, Pontiac)
8 = automatic transmission ( even #'s are auto , and odd #'s are manual trans)
Built on the 188th day of 1984
1708 = built in the 1980's
4 = exact year of mfgr. 1984
2 = 4bbl, federal emissions standards
8 = ? (0,1,2, chevrolet/4, buick/5, Oldsmobile/6,7, Pontiac)
8 = automatic transmission ( even #'s are auto , and odd #'s are manual trans)
Built on the 188th day of 1984
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
It's a 1984 Truck carb that's been commercially rebuilt. It's a poor choice for a carb on a '73 Vette, since it's not only a carb likely to have significant problems due to the commercial rebuild, but it's the incorrect model/series carb (it's an M4M carb instead of the correct '73 4MV carb) for your car and it's equipped with the fat primary truck rods to really mess up your WOT performance... I wouldn't recommend using it or putting any effort into it.
Lars
Lars
Thread Starter
Instructor
Joined: Jan 2012
Posts: 215
Likes: 6
From: Mebane, NC
re
Thanks all for the info. Lars thanks for the details. Other than one incident of low power caused probably by dirty secondaries the carb has worked well. The car doesn't get pushed too hard. Shift point is usually under 3k. Is this carb really that evil? Or do I need to push the car more? Running high test E10. Add Stabil when I know the car is going to sit for long periods, but have no idea what abuse POs gave it.
Storms are blowing trees down. Focus now is getting the chain saw running. Carb/fuel delivery problem also.
Storms are blowing trees down. Focus now is getting the chain saw running. Carb/fuel delivery problem also.
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Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
It's not an evil carb, but it's not easy to set up for a Vette application if you want to optimize it: The booster venturies are set up for low-rpm response, and you'll be lucky to find jetting specs for it to use as a baseline - this makes it tough to identify any issues caused by the commercial builder. If the carb is running well, that's great. If it's not, setting it up right can be a trick. 
Lars
Lars