Cylinder Heads, Edelbrock, Performer RPM, Buick, Complete

Edelbrock’s "Performer" RPM cylinder heads are designed to boost the performance of your Buick power plant. Designed for 400-430-455 engines, the 68cc combustion chambers produce 9.2:1 compression ratio with stock pistons. Cylinder heads are available bare or completely assembled with 2.125" intake valves and 1.75" exhaust valves. Another great feature is big 130cc exhaust ports, which allow the engine to breathe and increases power. Perfect for street and strip cars.

SPECIFICATIONS Head bolt torque: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 ft./lbs. (Top Row Bolts;), . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 ft./lbs. (Bottom Row Bolts; All Others) Intake Bolt Torque: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ft./lbs. Combustion Chamber Volume: . . . . . . . . . . . . . . . . . . . . . . . . . 68 cc Intake Port Volume: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 cc Exhaust Port Volume: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 cc Deck thickness: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5/8" Valve Size: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Intake- 2.125", Exhaust- 1.750" Valve Spring Diameter: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.55" Valve Spring Installed Height: . . . . . . . . . . . . . . . . . . . . . . . . 1.900" Valve Spring Pressure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 lbs Max. Valve Lift: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .600"- Check Spring Pressures Per Cam Manufacturer. Valve Spring Coil Bind . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.150” Rocker Stud Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/8” Pushrod Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/8” Replacement Valve Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . #5792 Valve Seats: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardened, Interlocking, Compatible w/ Unleaded Fuels Valve Spring Retainers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7°.4140 Steel (#9644)” Valve Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11/32” x 7º (#9615) Rocker Arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustable 1.6:1 Ratio Required Pushrods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Custom Length Pushrods. #9605 (Overall Length: 9.650”) Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14mm x ¾” Reach, 5/8” Hex, Gasketed Seat