Departing from the in-line valve head, their splayed-valve castings have a 0.240" minimum port wall thickness so your favorite head porting expert can perform extensive modifications for greater airflow. Intake valve angles are 11 degrees, with a 4 degree tilt. This is an extremely aggressive, all-out competition race head designed to make the absolute maximum power from your small-block Chevy with no regard to streetability. GM Performance's NHRA Competition Eliminator customers routinely make over 1000 horsepower (naturally aspirated) with this cylinder head.