JEGS
Cylinder Head for GM LS3 Gen 4 6.2L Engines
555-514050
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Rectangular Intake Ports
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
Specifications:
What would compression ratio be on lq9 bottom end? Will it work on 6.0?
Combustion chamber size is listed as 68cc in one section of the part description and 70cc in the bottom section of the part description. Is it 68cc or 70cc for combustion chamber?
Are these the light weight valve configuration the 821 casting heads come with ?
Flow numbers
Are there two heads or just one
What is the maximum valve lift on the included springs?
Can these heads be ordered with a .650 lift double spring?
Max lift on the springs?
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.