Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

7044240 - Jetting for a '73 FE Ford 390 w/'68 Heads

(1/2) > >>

65WildCat:
7044240 Question -- Correct Jetting for a '73 Ford 390 w/'68 Heads in a '76 F-150 Long bed - Bored .30 over - Have a 4 hole adapter approx 1" tall, Cold Ram Air Cleaner w/dual 4" ducts to outside inner engine bay- not direct Ram, Eldebrock Performer Intake, MSD Spark Box, Jacobs Coil, High Compression Pistons, Stock Rv type cam, Hedman Headers w/Dual Flowmasters - 2 1/2" w/H pipe running to rear bumper - Towing Converter, Auto C-6 Trans, Np 205 Transfer Case - 4 Wheel Drive w/4.11 Gears w/lockers and 33" Tires... Runs on the Street, my work truck....

Pulled apart carb and found #73 Jets with 49C primary rods - Secondary "T" Hanger with "C" Secondary Rods as read off the parts. Looks to be and I would guess the rest of carb is stock... I have no way to measure all the small air bleeds ect....

Jim

Cliff Ruggles:
The stock .073" main jets will be close.  If you are able to free up the APT screw in the baseplate it will open up tuning options.

I would install smaller secondary metering rods as well.....Cliff

65WildCat:
Thanks for the reply Cliff,,, I gave it the old school try to free up the APT screw to no avail.... Soaked in Mineral Oil, added heat... Even broke one side of the screw head off...  Those are a real pain..... For Now,, I just reinstalled the plug cover.... Would have been a nice extra since I just installed the primary bushings for it... Maybe I'll look at it later and see about drilling it out... Or, do you recommend to just leave it be... Do you sell replacement early APT screws.. I need a few other things from ya anyways.....

Jim

65WildCat:
O.K. ---- Got it figured out....  Thanks for the advice.... and reminding me 'bout that darned screw... Just needed a bit more time to figure it out.... I'll call ya next week for parts.....

Jim

Cliff Ruggles:
Yes, we have special APT screws for the early carbs that we make here in the shop on our lathe....Cliff

Navigation

[0] Message Index

[#] Next page