This BR 7 Cylinder Head is sold as an unassembled bare casting. LS7 300cc cylinder head is finished machined and includes valve guides and valve seats installed. Bare BR 7 Cylinder Heads do NOT include studs, valves, springs retainers or locks.

Cylinder Head Specifications

• Intake Port Volume: 300cc
• Combustion Chamber Volume: 72cc
• Valves: 2.250 in. dia. x 5.450 in. o.a.l. Intake / 1.580 in. dia. x 5.450 in. o.a.l. Exhaust (8 mm Stem Diameter) 

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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