Engines are warranted to be in good operating condition with reasonable limits of specifications (i.e. oil pressure, compression, and oil consumption). Only substantial engine noise or knocking will be considered defective. Only the block, head(s), and valve train, are covered under this warranty. Accessories such as oil pan, water pump, distributor, carburetor, exhaust manifold, etc. may be left on for customer convenience only and are not covered under this warranty. A heat sensor tab is installed on all engines. Warranty is void if heat sensor is removed or melted due to overheating. Front and rear seals and timing belt must be replaced at time of installation or warranty void.