RARE VERY NICE, ORIGINAL GM 1963-1964 Impala SS 409 425 HP QB Dual Quad 3844422, STANDARD BORE SHORT BLOCK. These is the short block you need for correctly building a 62 409hp dual quad 409 or a 63-65 425hp motor. THE BLOCK HAS THE X MARKING, SHIPPING INFORMATION p 408 six five 0 four766 POSSIBLE CA DELIVERY ON BLOCK. THIS BLOCK IS STANDARD BORE AND COMES WITH CRANKSHAFT, PISTONS AND RODS. ORIGINAL OWNER PULLED THE BIG BLOCK ENGINE OUT OF HIS IMPALA YEARS AGO, TO SWAP OUT FOR A SBC IN ORDER TO GET BETTER GAS MILEAGE. IN VERY NICE CONDITION AND TURNS FREELY bt 5500.00 OBO