I apologize in advance for the offense I'm about to cause to all my FAR more learned brethren here, but is a Quadrajet a Quadrajet?

Specifically, can the Quadrajet that's gone south on my 5.0-liter (307) V8 in a 1989 Custom Cruiser be replaced by a good one from a 1983 Oldsmobile 98 with the same (or so I assume) engine?

Though the price almost makes it worth the gamble regardless, it is still a three-hour drive to go get it. Oh, and if it doesn't work, I still had to pay for the de-/install in the end.

Thanks in advance,

Drew

 

Yes, they should both be ccc carbs with elec. plug ins.

 

They are NOT identical. The 83 carb has a different idle bleed control than the later carb. Also, the roller cam 307s have different calibration than the flat tappet cam 307s. If you were going to rebuilt the early carb to match the specs on the later motor, it could be made to work, but if you are just trying to bolt it on and go, you may be disappointed.

 

Having replaced the 'computerized' Quadrajet 4 times on a '86 grand Prix 2+2 with the 'corporate' 305, maybe I can help.
My main reason for replacement was the primary throtte shaft became worn, causing a detectable vacuum leak every 60,000 mies. I was able to find some very low mileage carbs at swap meets, and after asking a few people 'in the know' that it was very common. [sold w/230k mi.]
Never had any other probem with the carb other than that.
Changing it is pretty straightforward, with needing a base and air cleaner gaskets and some teflon tape and filter for the fuel line for parts.
3/8" line wrench, 1/2" sockets and mostly common tools will get it done!

Personally, I'd go for a rebuilt, as it should have bronze or oilite bushings installed for the throttle shaft problem.

 

I admit I'm wrong on the application, but I do know that tef. tape is not used on the fuel inlet fittings.