The Edelbrock 77359 Victor Jr. Small Block Ford cylinder heads offer high horsepower potential on competition level engines and are compatible with OE valve train and pistons for bolt-on convenience. VICTOR JR. 20° - 210cc FEATURES: 500+ horsepower potential out-of-the-box using stock valve train geometry High-flowing 210cc intake ports and .130" raised 75cc exhaust ports Available with 60cc or 70cc combustion chambers 70cc combustion chambers are ideal for turbocharged and supercharged applications CNC gasket-matched port entries/exits with blended valve bowls Spark plug holes and valves are in the stock location Valve cover rail raised .150" A relief in the head allows most roller lifters to be changed without removing heads INSTALLATION NOTE: Check cam manufacturer's specs for compatibility with valve springs. Recommended valve sizes listed. Match with Edelbrock head gasket sets. Use Head Bolt Kits for easy installation. These heads require the use of a 14mm x 3/4" reach, flat gasket spark plug with a heat range appropriate to your application. Deck thickness: 5/8", rocker stud diameter: 7/16", pushrod diameter: 5/16" (width of slot in guide plate).