Cylinder Head Specifications: Combustion chamber volume: 64cc /68cc; Intake runner volume: 185cc / 225cc / 260cc; Exhaust runner volume: 75cc / 88cc; Intake valve diameter: 2.02" (185cc) / 2.10" (225cc); Exhaust valve diameter: 1.60"; Valve stem diameter: N/A; Valve guides: N/A; Deck thickness: 9/16"; Valve spring diameter: 1.46"; Valve spring maximum lift: .575"; Rocker stud: 3/8" (185cc) / 7/16" (225cc); Guideplate: Hardened steel; Pushrod diameter: 5/16"; Valve angle: 23°; Exhaust port location: N/A; Spark plug fitment: 14mm x .750 reach, gasket seat * Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. INSTALLATION NOTES; Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Edelbrock pushrods #9632 are recommended. Requires hardened pushrods. Pedestal mount rockers. When using hot air choke Q-Jet carbs,choke kit #1932 is required.
