I have 2 carbs one is a 7040244 off a 350 motor, it has a solid base and the fuel inlet is good. The other carb is a 7040240 off a 455, this carb's base is cracked at the primary butterflies and the fuel inlet is stripped. I know one thing I could do is install new bushings in the base and heilicoil the fuel inlet but what I was thinking on doing was taking the internals off the 240 carb and installing them in the 244. I think the 244 carb is a better carb but can I just switch out the jets and metering rods and be good to go? Can any one give me a quick rundown on the parts I'd need to swap to make the 350 carb push my 400 like the 455 carb? Any advise would be appreciated. Thanks
Those two carburetors have a completely different calibration. Best to keep the main castings, baseplates and throttle bodies together as units. If you swap out any part, it will not be in calibration, and may require some custom tuning to get it to work correctly......Cliff
no its not that simple. Cliff is correct they are two different animals. youre best off finding a different 1970 455 carb or rebuilding the one you have as a complete unit.
Thanks guy's I knew I wouldn't get off that easy, would it improve the 350 (244) if I at least got larger jets or would I still not have enough carburetor for my 400 (I have a big cam in it)? I'm just trying to work with what I have.
Increasing jet size on either of those units can throw them out of calibration. The factory used an APT system in the baseplate to control the exact metering rod position in the jets. This set part throttle A/F right where they wanted it. We free up that system here, to make it adjustable, for fine tuning on the engine once the carburetor is placed in service. I don't recomend changing jets until the carburetor is completely/correctly rebuilt, and placed in service/tested. The engine will tell you if it needs help in any area......Cliff
Well I guess I'l hilicoil the fuel inlet on the 240 carb, thanks for the advice or I'll have to rebuild one of my Holley's.
