Original Holley 3247 Corvette Carburetor 1966 date code 973. This is carburetor with for a 1966 Corvette with a 427 engine making 425 hp.The General Motors number is 3886101-EI. Restored to its original Holley color, all of the steel hardware has been re-plated to the original finish. Carburetor retains the factory Holley calibration. Very hard to find with the correct metering block, the primary being 4901 and the secondary being 4519. Before this leaves our facility it will be test run on our motor to ensure a trouble-free installation.