PRO-X LS3 CYLINDER HEADS. CBM Motorsports Pro-X CNC ported aluminum cylinder heads will unleash the horsepower, torque and performance that your LS engine is capable of. CBM Motorsports Pro-X 6 bolt cylinder heads for LS style engines are. Designed for 4.065 or larger bores and LS3/L92 intake ports. They also feature a raised rocker rail for improved rocker arm/valve cover clearance and are capable of making well over 1000hp. We 100% CNC port all intake and exhaust runners, blend the bowls and match the ports. The combustion chambers and ports have been carefully designed to achieve the very best combination of high flow capabilities along with outstanding port velocity. An…