Cylinder Heads

The Northstar cylinder heads are semipermanent mold cast aluminum with powdered metal valve seat inserts and valve guides. Two 33 mm intake valves and two 29 mm exhaust valves are actuated by direct acting hydraulic lash adjusters. Separate intake and exhaust camshafts are supported by five bearings machined into the cylinder head with camshaft thrust taken by the first bearing (the left hand intake cam has an additional bearing to accommodate the water pump drive). The combustion chamber is roughly in the shape of a clover leaf with a nominal volume of 51.8 cc and a centrally located spark plug.