RHS 3.900” Bore LS7 CNC-ported cylinder heads from COMP Performance Group, are rectangular-port heads that can bolt onto 5.7L-6.0L LS engine blocks for up to 100 hp gains over the stock components. The heads’ intake ports are raised .220” from the stock location for a straight line of sight into the cylinder. Additionally, a .750”- thick deck surface and reinforced rocker rails make for more rigidity in high horsepower and boosted applications.