Flow Chart

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.

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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