Hi guys, I am putting a 1985 300 6 in a 56 F100. I found a very nice running 1985 F150 and bought it for the engine thinking I was all set. Then I found out about the feedback carb and computer controlled distributor. I went boneyard searching and found a 83 f250 with a 300 but the carb was missing. I bought the ignition wiring harness and distributor off it. So I should be all set to convert this 85 over to the older duraspark set up except the carburetor. My engine and the 83 had a sort of square looking flange where the carb bolts on with a egr valve. I also saw a 1977 f150 in the yard that has a intake manifold with a round maybe 1-1 1/4 hole and no egr. The carbs on both the yard trucks are gone. I can go back and buy the intake off the 77 (round one) if I need to. What carb do you recommend for this? I see some on ebay but I don't know which is which. Is there a certain model # or something I should look for? Anyone out there maybe removed a intake and carb to go to 4 bbl or something and would sell me their original? I won't be hooking up the egr so maybe it would be better to get the intake off the 77 and get a carb for that? Please give me your advice/ input. Thanks, Greg

 

Any non-feedback YF-style carb could be used, but some have 2 11/16 bolt spacing and some have 2 15/16 spacing, and some are slotted for either spacing.

 

On my 1986 F150 with 4.9L engine, when converting to Duraspark ignition, I used a Carter YF from a 1970 F350 with 300 engine [calibrated for zero emissions and no EGR]. I have been pleased with the results. I did have to elongate the mounting holes... very easy to do with a rat-tail file.

 

Thanks guys. So any Carter YF should work you think? I see there are alot of them on ebay. Thanks again, Greg

 

A lot of 1V carbs were used on various cubic inch engines and the innereds, jets etc. were for specific engines, make sure you get one for the 4.9 / 300 engine

 

Sounds Good thanks!!

 

Hey Greg, Ive been looking around for info on my 300 and stumbled across this. I believe I still have an original carb on my spare 1978 donar around truck outback. Not sure what shape it's in but let me know if you found one somewhere else.

 

Sending you a PM Beedy. Thanks.