WP-38 Short water pump for GMC 1939-1960 270 series. Short shaft water pump with aluminum pulley and 3/8" groove. Length of shaft is 3 1/2" from front face of block to end of shaft. Special made water pump with aluminum pressed on pulley. Water pump fits GMC 228-236-248-256-270 and 302 cubic inch engines made between 1939 and 1960 and Chevrolet-Pontiac 216 and 224 1937-1940.