anyone know which Ford pickups from the 80's these carbs came on? I can't seem to find any info on google about it. And if it matters, I'm looking for the one that was rated at 210 cfms.
The only info I have on the Carter YF carbs is it begin to appear in 1967 on California emissions equipped engines. By 1970 it was standard on 170's and 200's. It remained "the" six cylinder carb until 1979. They were rated at 150 CFM on 170 c.i. engines and 187 CFM on 200's. The YF carb was also used on the 250 engine from 1975 -79. The 250 version of the YF was rated at 195 CFM. The "RBS" Carter was used on 250 c.i. engines from 1970 to 1973. It was rated at 215 CFM, and had the larger throttle bore & base flange.
I completely forgot about this topic. I know it's a bit late but thanks for the info. According to someone at FordSix those 300 YF's should be a simple bolt on to a 200. Again, thanks for the info.
dragging up this old thread because i have some usefull info to add the big 6 (240 and 300) YF's have a larger throttle bore then the maverick rbs of car yf carbs so they have to improve the flow cfm they are also taller and could present a hood clearance issue in some cases much less on a 170 or 200 vs the 250. I put one on my 73 250 it bolted to the stock egr spacer the throttle linkage bolts right up but there are no automatic kickdown provisions but the could be easily fabricated and added. a longer fuel line will be needed due to the added height its also a good time to add the heat shield some cars recieved with the rbs to help with fuel perculation issues (even more common with ethanol based fuels nowdays) this causes hard hot starts as fuel boils over into the intake through the booster . as for a air cleaner this will vary greatly with what you want astheticly and what room you have, im not even sure what you could fit with a stock hood and the 250 as i have a hood scoop and utilized this room.. there are several rebuild kits avalible for these make sure you have the oem tag or finding a kit will be a guessing game unless you get the "master kit" One might ask why change to the YF? i did for several reasons adjustable metering rod ( simple screw adjustment can change the mixture curve to compensate for mods,fuel milage etc etc) trying to get away from the fuel perculation issues somewhat better accel pump circuit over the rbs bigger throttle bore = better responce and maybe better power (big 6 YF) hoping for better milage out of the change it had a manual choke as for the shorter more hood clearance friendly YF i have nothing to add as i have not seen or used one of them I picked up my 1968-69 van/truck yf for 10 bucks at the junkyard threw a 17 buck rebuild kit in it
