Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Recipe for Ford 300

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F250 Restorer:
I have a 17059247. It is going on a newly rebuilt Ford 300 (306 ci) in a truck with a manual trans and 3.31 rear gears. The engine is about 250 hp, with just under 9:1 cr, with a fairly large (280 adv., 220 @.050, .480 lift, 112 lsa)cam, 14hg at idle. I was going to use 'Recipe #1' in cliff's book, but wasn't sure due to the engine being a 6 instead of an v8.

I am also curious about whether to drill the primary butterflies to add some bypass air. I am using a baseplate from another 1705 without bypass air. If so, how much? Thanks for the help.

Cliff Ruggles:
Do NOT swap out the baseplates, always use the original one that came with the carburetor.

Do NOT drill the throttle plates, use the idle bypass air system if/as needed instead.

With that much cam in the little 300 you are going to need some additional idle fuel and some bypass air.  I'd be looking closer to recipe #3 instead of #1.

Make sure to get one of my rebuild kits for the carb. I will include the later design high flow N/S assembly and it comes with a lifetime warranty accl pump with new custom wound springs and pump seal.  You will also get the secondary cam/spring as well.....Cliff

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