Edelbrock Cylinder Head SB Chevrolet Performer RPM E-Tec 200 for Hydraulic Roller Cam Complete (Ea)The Edelbrock #60985 E Tec cylinder head is replacements for 302, 327, 350 & 400 c. i. d. S B Chevy engines with "Vortec style" manifolds. They feature an LT1 style raised runner intake port design for increased air flow and ultimate performance. A unique combustion chamber design positions the spark plug closer to the center of the cylinder, promoting a more efficient combustion resulting in more power. This head includes an adjustable rocker stud