I have a 70 351C, I guess its a 2 brl. Two holes in the bottom right? Anybody have a good recommendation for replacement as the stock (autolite I think) is hissing and wont idle very well. Thanks...
Two barrels = two holes. The 2V on the aircleaner stood for "2 Venturis". Bolt on replacements: Either a Holley list # 7448-350 cfm 2 bbl, Or the Holley list # 4412 500 cfm 2 bbl. The 500 will give it an up to 20 hp kick in the pants. You can call it a 4 bbl performance enhancer in a 2 bbl package. The 350 is pretty much a stock replacement. Both will bolt on, with only a minor reroute of the fuel line to make them work. Just remember to install an in-line fuel filter between the pump and carb. Once you set it, leave it alone. Only thing that will stop a Holley is water or dirt in the fuel. If it seems that it's gotten out of tune, look elsewhere for the problem ( ignition usually, especially if you're still running points) One more thing: I see you're in south Texas. If you decide on either Holley, get a manual choke model and wire the choke open. You'll never need a choke down there. Paying the $20 or so extra for an electric choke model is a waste where you're at. Me, personally, I take all the choke parts off the carb, including the choke butterfly.
Thanks, great info. Im only in Texas for another couple weeks then Virginia. The one I have now has a choke heater? Do the Holly's? If not do I just gasket up that hole?
Electric choke Holley's are just that, electric, one wire hook up to operate it. Manual choke Holley uses a pull-cable to operate it, like the ones on lawn mowers. The cable attaches to the choke lever on the pass. side of the carb and is routed thru the firewall and mounts under the dash. When it's cool enough to need a choke, I just "baby" the motor after starting till it idles on it's own. The heater you've got just bolts into the intake doesn't it ? In that case just leave it where it is or remove it and replace the thing with a metal cover.
Well I got the replacement from autozone. It actually works like a champ. Im a little confused on what I have though. They said it was a holley and it came in a holley box but the diagrams in the instructions are a motorcraft. And its exactly like my old one which I know is a motorcraft. Are they the same company?? Anyway, like I said it works much better. Still Idling around 800 RPM but thats way better than 2000. Also missing a bracket or something for the spring for the kickdown linkage. Where does it attach to the carb?? Lots of stuff I know. Thanks for any ideas... :SNSign:
The Holley 2 bbl is a model 2300. Autolite 2 bbl was a 2100. Two different carbs. Two different mfg's. Holley has made carbs for Ford to Ford's specs that are also Holley designs, but the 2100 wasn't one of them. Ford has also used Holleys many times as O.E. carbs. These also had Ford part #'s on them but they were Holley carbs.
Look on the side of the fuel bowl, behind the accellerator pump rod, there's a number cast into the bowl. Biggest Autolite 2 bbl was a 1.33 which was a 434 cfm carb. The 1.23 was a 365 cfm. Don't recall offhand what the smaller ones were.