Items You Need
Bare Cylinder Heads
1175800 Features:
- For GM LS1/LS2/LS6 cathedral port applications
- 245 cc intake ports
- 70 cc exhaust ports
- 13.5° valve angle
- Intake port flows 370 cfm
- Exhaust port flows 235 cfm
- 100-percent CNC ported A-356 aluminum
- Blended valve bowls
- Requires 2.100 in. intake valves
- Requires 1.600 in. exhaust valves
- Flat Milling: .0060 in. per cc
- Intake Valve Seats: 2.200 in. Diameter x 3/8 in. Thickness
- Exhaust Valve Seats: 1.650 in. Diameter x 3/8 in. Thickness
- Standard lifters
- Drilled accessory bolt holes
Installation Notes:
- Uses a NGK R5671A-7 for pump gas and NGK R5671A-8 for racing gas
- Recommended head gaskets: Cometic Chevrolet LS Series Cylinder Head Gaskets
- Torque for 11 mm studs: 85 ft-lb with oil
- Torque for 8 mm studs: 26 ft-lb with oil
- Spring pockets can not be cut larger or deeper than 1.500 in.
Specifications:
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.