From a carb rebuild sit eon the net:
Quote:
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Chevrolet used various versions of the Carter W-1 as original equipment from 1932 through 1949. In addition to the original equipment (O.E.) carbs, other units were offered as replacements; as Carter continued to improve the performance and reliability of the W-1. However, do not believe that all W-1 Carters were used on Chevrolet; as 128 different W-1 carburetors were built.
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I think before a chev owner orders these, he should check the chev parts manual and see if the number matches. My CMP chev manual shows a needle seat part number of 25-338 or ac111352.