The Edelbrock part # 77939 Big Block Chrysler Max Wedge Victor Series cylinder heads are used by many of the best racers in the country and are the best choice for all-out competition. Edelbrock engineers work with leading racers like Billy Glidden, John Urist and Pat Musi to produce the ultimate components for racing. The end results is competition ready cylinder heads that feature cylinder heads are compatible with OE valve train and pistons for bolt-on convenience while Victor cylinder heads feature raised runners, revised chambers and relocated valves for all-out competition. VICTOR B/B CHRYSLER MAX WEDGE FEATURES: - The best standard port location cylinder head available for competition big-block Chryslers - Intake ports are raised .650", exhaust ports are raised .250" for improved flow - The intake flange is extended .950" to eliminate the need for intake spacer plates - Cylinder heads will fit Edelbrock Victor manifolds for both high and low deck engines - Sold without springs or retainers; use recommended springs to match your camshaft - Exhaust flange is extended .300" from stock (same as Mopar Stage 6) featuring dry exhaust bolt holes with Heli-Coil® thread inserts - Max Wedge intake ports are machined to match intake manifolds for B and RB competition big-block Chryslers - 72cc combustion chamber volume - Cylinder head part # 77939 comes bare only INSTALLATION NOTE: For headers, contact TTI (951) 371-4878. Offset intake rockers required, exhaust side accepts standard-spec rockers. May require additional pushrod hole clearance for some combinations. Bare heads will have valve guides & seats installed, but will require final sizing and a valve job to match the valves you will be using. 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", pushrod diameter: 3/8".