Cylinder Head, Pro 1, Aluminum, Assembled, 62cc Chamber, 205cc Intake Runner, Chevy LS1, Each

Upgraded cylinder heads for your LS1.
Dart calls these Pro 1 LS1 cylinder heads a secret weapon. Using their proprietary "Speed Flow" technology and the same aircraft-quality 355-T6 aluminum used in their Pro Stock heads, Dart has produced these affordable, yet powerful LS1-type cylinder heads. Five-axis, CNC-blended combustion chambers generate improved airflow and flame propagation, which increase both power and torque. With two available intake-port sizes that flow very well as-cast, there is a choice for strong street performance, as well as one for maximum street performance or bracket racing. These heads have extra material on top for added flexibility to upgrade the valvetrain, and they're set up for big valves with bronze valve guides and hardened seats. They're available either bare or assembled, and they're drilled for stock accessories with stock port locations, so you can use stock components.