Edelbrock Cylinder Head SBC NHRA Legal 64cc Angled Plug Bare Single

The Edelbrock Victor CNC 12 6-Bolt Head for GM LS7 291cc/69cc Individual #77666 is designed for maximum effort naturally aspirated and boosted applications. It features .220 raised intake runners and .100 raised exhaust ports that provide a better line of sight into the cylinders and allow for an improved short turn. The raised intake runner design fits both stock and aftermarket LS7 intake manifolds and can be used with stock or aftermarket valve trains. The head utilizes the GM LS 6-bolt design, making it compatible with the GM LSX block and all aftermarket iron or aluminum 6-bolt per cylinder LS race blocks. The 6-bolt design offers increased clamping capacity over the standard factory 4-bolt configuration and improves head gasket sealing – ideal for high compression naturally aspirated engines and high boost applications. Features include a 12-degree valve angle and fully CNC-machined ports for maximum airflow. CNC-machined runners and chambers, as well as the .220 raised intake ports and 12-degree valve angle, increase overall flow capability, while a revised water jacket design enhances thermal conductivity and tunability. The manganese bronze valve guides withstand long wear with emphasis placed on holding precision tolerances on valve seat concentricity, allowing the valves to seal securely, which eliminates leak down and increases cylinder pressure during engine operation. Finally, the .700 thick deck and .400 raised valve cover rail make this head ideal for maximum horsepower and high valve lift applications. All Edelbrock Victor CNC heads feature patented Clean Cast Technology(TM) , a process that eliminates casting flaws and promotes a smoother internal surface finish for greater air and coolant flow. These benefits provide more power and increased cooling ability. Part #77666 is a bare head that features: 307cc runners, 69cc chambers, 2.250 intake/1.615 exhaust valves, copper valve seats and no down nozzles.
The Edelbrock Victor CNC 12 6-Bolt Head for GM LS7 291cc/69cc Individual #77666 is specifically designed for maximum effort naturally aspirated and boosted applications.

• Premium 110 BHN aluminum alloy, .220″ raised intake port, .100″ raised exhaust port, Copper valve seats, 307cc or 291cc intake port volume, 2.250″ or 2.200″ x 1.615″ valve job

Cylinder Head Specifications: Combustion chamber volume: 92cc; Intake runner volume: 442 (lh) / 451 (rh); Exhaust runner volume: 189cc; Intake valve diameter: 2.45″ (Valves Not Included); Exhaust valve diameter: 1.85″ (Valves Not Included); Valve stem diameter: N/A; Valve guides: Manganese bronze; Deck thickness: N/A; Valve spring diameter: Pocket diameter 1.76″ (springs not included); Valve spring maximum lift: N/A; Rocker stud: Use Jesel KPS-381754 shaft-mount; Guideplate: N/A; Pushrod diameter: N/A; Valve angle: 18° x 4.0° intake; 9° x 3.9° exhaust; Exhaust port location: N/A; Spark plug fitment: 14mm x 3/4 reach, gasket seat. * Intended for high output, large cubic inch racing engines with 4.84″ bore spacing, this head is an improvement over existing 18° designs, such as the Big Chief & Big Duke. The casting is made from A-356 aluminum and is Hot Isostatic Pressing processed (HIP) for superior strength, durability, dimensional stability and exceptional finish quality. These cylinder heads feature CNC ported intake ports and a raised exhaust runner design for improved flow efficiency. Chambers are fully CNC ported and extra material is included in the deck to allow fine tuning of the combustion chamber design, if desired. Edelbrock and Pat Musi worked with Jesel to improve the valvetrain geometry, delivering Pro-Stock level technology on engines up to 10,000 rpm. Jesel’s shaft-mounted system, #KPS-387154, is made from lightweight 7000 series aluminum and features a one-piece stand design that pairs the intake and exhaust stands for improved valvetrain stability. The intake features a 1.820″ long fulcrum and is available in 1.60:1 – 1.95:1 rocker ratios; the exhaust features a 2.000″ long fulcrum and available in 1.60:1 – 2.00:1 rocker ratios. Requires Edelbrock valve covers #4259. Match with Edelbrock Victor CNC Series manifolds #28003 and #28005. Pro-Port version available for custom porting.
Cylinder Head; Chevrolet; Big Victor; Big Block (Pro Port); HIP d; 14-deg. Intake Valve

• 4.84 in. Bore Spacing/Unmachined Combustion Chambers
• Requires Edelbrock Valve covers PN 4259
• High Isostatic Pressing Design
• For Big Block Chevy
• Bare Head