Quick identification of Chevrolet W-1 carbs (remember that Carter made 128 different W-1's, so they were used on other than Chevrolet)
1932 - high idle screw, no vacuum for distributor
1933 - high idle screw, distributor vacuum port
1934,35 - 2 screws air horn, 2 screws bowl cover
1936 - 3 screws air horn, 2 screws bowl cover
1937,38 (different, but to tell these 2 from other years):
4 screws bowl cover, round pump, turned under throttle arm
1939,40 - same as 37,38 but conventional throttle arm
1941-1948 - flat accelerator pump, no fast idle (flat rod)
1949 - different flat accelerator pump, fast idle rod.
These are for the Master and Truck carbs; the Standard carbs are different yet.
There are EIGHT different kits for the above listings. There are several more for the Standard series carbs.
Oh, almost forgot, the 1932 truck has a smaller venturi, and has the letter "T" cast on the side. That makes 9 different kits.
Jon.
