Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Poor Fuel Mileage on 4.3 V6 with Quadrajet 17056250
don3194:
Okay, thanks. I'm friends with a guy who owns a machine shop, I'll ask and see if he has any pin gauges. What size for the jets should I be looking at?
Cliff Ruggles:
My listing skips that part number but it may be an early APT Olds unit with the auxiliary power piston.
If it has the second power piston and single metering rod it will have pretty small jets in it.
Personally I avoid those here. They had a very brief run and were abandoned for the far superior late style APT units, and for good reason.
1975-76 units with the APT in the left front corner (as viewed from the front) have fundamental issues related to the design.
The ones with the auxiliary power piston are the worse of the bunch.......Cliff
don3194:
Sorry for the delay, It does have a secondary powerpiston with a single metering rod on it. I actually just happened to pick up a decent looking marine quadrajet, 17059286, for $20. Do you think I should rebuild the one I'm currently using or maybe try rebuilding the marine carburetor?
(At least I think its marine, the Division number 8 seems to be unclear.)
don3194:
--- Quote from: don3194 on February 03, 2021, 11:00:09 PM ---Sorry for the delay, It does have a secondary powerpiston with a single metering rod on it. I actually just happened to pick up a decent looking marine quadrajet, 17059286, for $20. Do you think I should rebuild the one I'm currently using or maybe try rebuilding the marine carburetor?
(At least I think its marine, the Division number 8 seems to be unclear.)
--- End quote ---
I thought about this overnight, and figured that I could probably turn around and sell this one and pick up a better automotive replacement. I just need an honest opinion, even though I think I know what it will be
Cliff Ruggles:
I would NOT for any reason use or attempt to use a Marine Quadrajet for what you are doing.
Get a later model side inlet Chevy carburetor preferably a single main airbleed model from a 1979-up truck application. They are e-choke or will easily convert to e-choke, and very well made units.
Most Marine carburetors were divorced choke, no APT, crappy hinge pin/float design, and calibrated for heavy loaded most of the time vs light load, fuel economy, passing emissions, etc.
Most will not even have a vacuum port for the distributor vacuum advance either. There are PLENTY of later model Q-jets out there and usually pretty inexpensive to buy as cores. Avoid anything "rebuilt" or commercially "remanufactured". I relatively clean and unmolested core will be best.......Cliff
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