Edelbrock E-Street cylinder heads for GM Gen IV LS3 engines deliver an affordable aluminum cylinder head upgrade designed for street-driven and mild-performance LS applications. Featuring efficient combustion chamber and port designs, these assembled heads improve airflow, horsepower, torque, and engine efficiency while maintaining excellent factory component compatibility.

Edelbrock 77620 Features:

• GM Gen IV LS3 engines
• 15-degree valve angle
• A356-T6 heat-treated aluminum construction
• 69 cc CNC-profiled combustion chambers
• 260 cc as-cast intake runners
• Rectangular intake ports
• 2.165 in. intake valves
• 1.590 in. exhaust valves
• Beehive valve springs for camshafts up to .570 in. lift
• COMP Cams valvetrain components
• Manganese bronze valve guides
• Powdered-metal valve seats compatible with unleaded fuel
• One-piece stainless steel valves with hardened tips
• Dual spark plug pocket design for tapered-seat or gasket-seat spark plugs
• Reinforced rocker arm bosses for increased strength
• Assembled and prepared for installation out of the box
• Sold as a pair

Edelbrock 77620 Notes:

• Fits 2007 and later GM Gen IV LS3 engines and other Gen III/IV LS engines
• Compatible with 7.0L LS engines using LS7, C5R, or sleeved production blocks
• Designed for engines with 3.900 in. or larger bore diameters
• Can be used on 4.8L and 5.3L engines with 3.780 in. bores after verifying valve-to-piston and valve-to-bore clearance
• Requires new cylinder head bolts or studs with hardened washers
• Accepts stock or aftermarket Gen III/IV rocker arms
• Correct pushrod length must be verified during installation

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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