Chevy LS3 /L92 Rectangle Port Bare Aluminum Cylinder Head. Bous Performance aluminum cylinder heads offer horsepower, torque and performance that your LS engine is capable of achieving. Bous offers 6 & 4 bolt cylinder heads designed for engines with 4.065 or larger bores and LS3/L92 intake ports. Features a raised rocker rail for improved rocker arm/valve cover clearance. Our cylinder heads have been carefully designed to achieve the economic growth from a cylinder head right out of the box, and yielding larger capabilities of port velocity with potential of more flow volume with intake and exhaust runner, with room for a CNC program that blends the bowls and Port matching…