Super Stock* heads and crankcase, Easy start 585 gear drive cams with redesigned cam cover, TC3 oil pump and cam plate, Made in the USA, Intake system not included; compatible with stock or aftermarket intake systems., Revised oil routing on '99-'06 Touring models make it so an oil line installation kit is no longer required., Cylinder heads on T-Series long block engines are '99-'05 style. Owners of '06 models will need to purchase a set of '99-'05 style, offset intake flanges., Cylinder heads on this engine is specially machined to compensate for the non-stock cylinder length. As a result, it is compatible with the manifold and throttle body with stock length intake runners. In addition, the breather vent bolt location has been adjusted so it is in the stock location, so stock style air cleaner back plates will bolt up to this engine.