This BR 7 Cylinder Head is sold as an assembled casting. LS7 300cc cylinder head is CNC finished machined. Assembled BR 7 Cylinder Heads will include valve guides, valve seats, studs, valves, springs retainers, and locks.

 Cylinder Head Specifications

• Intake Port Volume: 300cc
• Combustion Chamber Volume: 72cc
• Valves (Diameter x Overall Length: 2.250 in. dia. x 5.450 in. Intake / 1.580 in. dia. x 5.450 in. Exhaust (8 mm Stem Diameter)
• Valve Springs: 1.550 in. Diameter - Open Pressure: 770 lbs.; Closed Pressure: 260 lbs.; Installed Height: 2.155 in.; Max Lift: .800 in.
• Spring Retainers: 10 degree Titanium
• Valve Seals: 8 mm

   

  Facts and Related Components
• Torque Heads: 11 mm STUDS - 85 ft.-lbs. WITH OIL / 8 mm STUDS - 26 ft.-lbs. WITH OIL
• Torque Rocker Studs: 22 ft.-lbs.
• Intake Gasket: Fel-Pro p/n 375-1208-3 (.060), GM p/n 809-19172113
• Head Gasket: Fel-Pro p/n 375-1185-041 (4.175 bore) or GM p/n 809-12582179
• Exhaust Gasket: Fel-Pro p/n 375-1440
• Head Studs: ARP p/n 070-234-4319 (undercut studs)
• Spark Plug Specs: 14 mm Thread, .750 in. (3/4 in.) Reach, Gasket Seat (NGK R5671A)
• Valve Angle: 10 degree
• Flat Milling: .0060 in. per cc
• Dowell Shift: Standard
• Pushrod Slots: Standard
• Rocker Arms: LS7 style
• Lifters: Standard
• Intake Manifold: LS7 or Equivalent
• Valve Centerline: Standard
• Spring Pockets: 1.550 in. out of the box, May not be cut any larger or deeper
• Accessory Bolt Holes are Drilled

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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