This engine comes with a 30 DAY SHOP warranty under NORMAL DRIVING CONDITIONS (OEM PARTS MUST BE USED ON THIS ENGINE NO AFTERMARKET PARTS). Engine is under guaranteed against engine knock and excessive smoking. This limited warranty is void if engine have been disassembled before our inspection or if the center of installed head tab has been melted or removed. accessories, such as alternator, starter, carburetors, distributors, fuel pumps and water pumps are not covered under this limited warranty unless otherwise noted on you sales receipt.