Level 1 Performance Carburetor replaces factory OEM unit for later model (1974-1978) big block (396" and higher) GMC and Chevy passenger cars or light trucks with a hot air/climatic choke. This carburetor is not intended for R/V or Performance type camshafts. The jets in this carburetor have been changed from the standard .072" to .074".
This is a NEW aftermarket carburetor. It has been inspected, adjusted and tested by National Carburetors at our facility in Jacksonville, FL.