Edelbrock Cylinder Head Oldsmobile Performer RPM for Hydraulic Roller Cam Complete (Ea) 60515

EDE Performer RPM Cyl Head

Engine Cylinder Head

Oldsmobile:Big-Block:400 (6.6L)/425 (7.0L)/455 (7.5L)

Cylinder Head Specifications: Combustion chamber volume: 77cc; Intake runner volume: 188cc; Exhaust runner volume: 106cc; Intake valve diameter: 2.072"; Exhaust valve diameter: 1.68"; Valve stem diameter: 11/32"; Valve guides: Manganese bronze; Deck thickness: 5/8"; Valve spring diameter: 1.46"; Valve spring maximum lift: .575"; Rocker stud: 7/16"; Guideplate: Hardended steel; Pushrod diameter: 3/8"; Valve angle: 6¦; Exhaust port location: Stock; Spark plug fitment: 14mm x 3/4 reach, gasket seat. INSTALLATION NOTE: Head bolt holes drilled for stock 7/16" bolts, but can be easily modified for 1/2" bolts or studs by drilling the 1/2" counter bore. Aftermarket 7/16"-stud rocker arms and 3/8" hardened pushrods required. Will fit 350-403 Olds with Edelbrock manifold #7111 only (port matching required). 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: 7/16", pushrod diameter: 3/8" (width of slot in guide plate). Designed for high-performance non-emission 1965-76 Olds 400, 425 and 455 c.i.d. V8's. eart shaped chamber for a more efficient burn, outstanding horsepower and torque. Valvetrain has been upgraded from the factory pedestal-mount system to a 7/16" screw-in stud and 3/8" pushrod-slot guideplate for increased valvetrain stability. 60517 is not port matched or bowl blended and is NHRA-accepted for Super Stock (except 1968-1969 W-30) only. Deck thickness: 5/8", rocker stud diameter: 7/16", pushrod diameter: 3/8" (width of slot in guide plate). Head bolt holes drilled for stock 7/16" bolts, but can be easily modified for 1/2" bolts or studs by drilling the 1/2" counter bore. Aftermarket 7/16"-stud rocker arms and 3/8" hardened pushrods required. Replacement valve part numbers are for sets of 8.

Cylinder Head; Oldsmobile; Performer RPM; for Hydraulic Roller Cam. Complete (Ea)