Description
Holley Big Block Chevy Mid Mount Complete Accessory System 20 242 performance exhaust mufflers flowmaster hooker because the exhaust port centerline Year Make Model Submodel masks 6CK19TZZAA CRN because the exhaust port centerline on these heads is 5 8” higher and 3 8” out from the engine centerline compared to stock heads 1974 Plymouth Valiant