Not for use on engines with high mounted power steering pumps.All hoses, hardware, gaskets plus complete instructions. Designed to convert all Mercruiser stern drive engines with GM 305 & 350 cid blocks that have log style exhaust manifolds and raw water cooling to the newer more efficient center rise manifolds. Kit includes: Center rise manifold (2), Exhaust manifold (2), Thermostat housing (1), Thermostat cover (1), Thermostat (1).