CNC Ported AFR Cathedral Port, 6-Bolt LS Cylinder Heads - Assembled Little M2 Sportsman This assures that pistons rings

This assures that pistons rings are properly seated

The mechanical cam enables higher rpms and higher valve lift for more air flow

That means more horsepower

The addititional parts are not included

Retains all factory bolt hole locations

CNC Ported AFR Cathedral Port, 6-Bolt LS Cylinder Heads - Assembled Little M2 Sportsman This assures that pistons ringsThese AFR cathedral port heads bring a lot to the party with their 6 bolt design. We buy these heads as porter castings and machine them to perfection on our CNCs. The shapes we impart to the ports and combustion chambers reflect our years of experience on our own engine builds. We know what makes power and also survives the beating of competition. It's not chasing peak air flow at max lift by excessively cutting away the metal around the valve