Performer RPM Buick Cylinder Head Complete The Edelbrock 60049 Performer RPM Super Stock Cylinder Heads are designed for 400, 430 and 455 c.i.d. Buick engines. This cylinder head includes adjustable rocker stud and guide plate set-up for use with small-block Chevy style adjustable 1.61 ratio rockers. The large 68cc combustion chambers produce 9.21 compression ratio with stock pistons. Performer RPM heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. These cylinder heads deliver great throttle response and power from 1500 to 6500 rpm. They also feature the highest quality intake and exhaust valves and valve springs. For use on pre-pollution controlled vehicles only. Specs Application Universal GTIN 00085347600496 Combustion Chamber Volume 68.0 cu.in Deck Thickness 0.625 in Exhaust Valve Diameter 1.750 in Guide Plates Included Yes Intake Runner Volume 215.0 cu.in Intake Valve Diameter 2.125 in Material Aluminum Push Rod Diameter 0.375 in Rocker Stud Diameter 0.375 in Valve Angle 15 Degrees Valve Spring Diameter 1.550 in Valve Spring Maximum Lift 0.600 in Installation Notes Match with Edelbrock head gasket sets. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4 reach with flat gasket seat. Deck thickness 5/8 Rocker stud diameter 3/8 Pushrod diameter 3/8 (width of slot in guide plate).