As a rule, engines are complete assemblies including manifolds, oil pan, timing belts and covers, fuel injection or carburetor. We Guarantee only the long block. The manifolds, oil pan, timing belts and covers, fuel injection or carburetor, wiring harnesses, oil leaks, are not. We guarantee, no knocks, cracks, excessive oil burning. Our warranty covers the replacement of a defective part within the original warranty period. We warranty all parts for a period of 90 days from date received by purchaser or installer, Extended Warrantees, lengthen that time period. Engines, Transmissions, Cylinder Heads, Transfer Cases, Rear Ends, must be installed by a certified mechanic, Overheating voids guarantee, Make sure the heat tab is not melted or missing. Flow-check the radiator and repair it if necessary. Timing belts/chains must be changed on overhead cam engines. Warranties only apply to parts replacement. if a replacement part cannot be obtained a full refund will be issued to the original purchaser. Any refunds or exchanger must be accompanied by the original sales invoice. Warranties are limited to the original parts purchaser and are non-transferable. All used engine parts purchases are subject to terms and conditions of the Standard engine and Parts Warranty.