JEGS 555-514055 Rectangular Port Cylinder Head for GM LS3 Gen 4 6.2L Features:

• Designed for OEM and slightly modified engines
• Utilizes stock valves, retainers, and beehive valve springs
• Designed for center bolt valve covers
• As-Cast Intake Runners, Exhaust Runners, and Combustion Chambers
• Intake Port: Stock Rectangular Port
• Intake Port Dimension: 2.559 in. H x 1.251 in. W
• Intake Runner Volume: 257cc
• Intake Valve Diameter: 2.165 in.
• Exhaust Port: Stock D Port
• Exhaust Port Dimension: 1.427 in. H x 1.591 in. W
• Exhaust Runner Volume: 87cc
• Exhaust Valve Diameter: 1.590 in.
• Combustion Chamber: 68cc
• Valve Seats: 45 Degrees
• Valve Guide I.D.: .3145 in.
• Valve Guide O.D.: .500 in.
• Head Material: Cast Aluminum
• Replaces casting numbers: 5364, 821, 823, 12675871

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.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

FAQ

What heads are on an LS3?

• Rectangular port heads. The JEGS 514050 Cylinder Head is designed specifically for a replacement on GM LS3 engines, featuring high-quality components and precision engineering for optimal performance. Upgrade to these LS3 cylinder heads for improved airflow and horsepower.

Is it worth porting LS3 heads?

• Yes, porting LS3 heads can enhance airflow, leading to improved performance. Consider professional porting services for optimal results with your JEGS 514050 Cylinder Head. Unlock the full potential of your LS3 engine with a well-executed porting process.

How much HP do ported heads add to an LS3?

• Ported heads can add significant horsepower to an LS3 engine. While the exact gains vary, the JEGS 514050 Cylinder Head, when properly ported, contributes to substantial power increases. Experience a noticeable boost in performance with professionally ported LS3 heads.

Will new cylinder heads increase horsepower?

• Absolutely! The JEGS 514050 Cylinder Head replacement ensures increased horsepower and improved engine efficiency for GM LS3 engines. Upgrade confidently to experience enhanced power and performance.

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.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART