Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
1600 rpm idle
Cliff Ruggles:
The "U" shaped channel started showing up clear back in 1970 and was standard on most units by 1971. It requires the later carb to intake gaskets that are longer in the front.
I'd also add that your baseplate appears to be from a turbo carb and looks like the vacuum to the PP is routed in from the front so it woln't be drilled to supply vacuum directly. The front center vacuum fitting would need to be plugged (I prefer to remove them and seal the hole) and a vacuum supply hole drilled in the correct location like a non-turbo baseplate......
F250 Restorer:
Hey Cliff. Thanks for the feedback. Yes, it is a turbo QJ. The baseplate has been drilled. You can see the hole in the photo below.
I think the .125 gasket would seal this opening, but why chance it? I put in a lot of work on this carb and don't want to be troubled by phantom v. leaks. I found this at Jegs. Notice where the edge of the adapter is in relation to the mounting holes on the primary side of the adapter. I thought about using one of the metal heat barriers sandwiched between two gaskets to seal that edge, but that seems iffy.
as opposed to this:
Kenth:
This adapter might work for "U" channel Qjets to Holley intakes.
F250 Restorer:
Hey Kenth. Thanks for the adapter info. I saw that adapter. I avoided it b/c of the price tag. It costs $120, whereas the Edelbrock open style one I posted costs $60.
Do you prefer the 4 hole type? Pls explain.
77cruiser:
If you know someone handy with a tig you could build up that spot & machine flat again. I did one several years ago.
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