Sorry to be the bearer of bad tidings, but:
(1) Rochester 1 barrel and 2 barrel carburetors manufactured prior to the 1968 model year were identified by tag only (well, the very early 1 barrels up to about 1954 had the last 4 digits stamped into the original airhorn to bowl gasket). If the carburetor was rebuilt once, the original gasket was discarded, so the tag remained the only sure method of identification.
(2) Rochester carburetors CANNOT be identified from the "casting numbers". Casting numbers are usually (not always) in a circle or partial circle. These numbers will be "raised" numbers (standing proud of the casting surface). Casting numbers were used as an internal (to Rochester) number specifying a casting "blank" prior to machining. Thus the same casting (by number) could be machined a number of ways, thus creating different parts. Also, the decoding method by Lugnutz is NOT applicable to casting numbers.
(3) Beginning with the 1968 model year (after the last model B carb), Rochester began stamping the actual identification number into the carburetor body. This was required because of the Federal Clean Air Act of 1963, Amendment of the 1966. As the carburetor is considered a part of the emissions systems, it became necessary to be able to identify a carburetor.
(4) Commercial carb rebuilders (that sell through FLAPS) GROUP a number of carburetors together with one calibration. The tag was removed to prevent sharp customers from determining that they got the wrong carb from the FLAPS.
Please don't "shoot the messenger".
Jon.
So the bottom line, is getting a carb that will make the truck run good is pretty much impossible, and likely wont' run any better than the carb I have there now pouring gas in there. I can see why people scrap these 6's in favor of a V8. Is there any possible way to rejet these?
