BB-3 XTRA O Series Cylinder Head
• 335cc Oval Intake Ports
• 119cc Combustion Chambers
• 2.300'' Intake / 1.880'' Exhaust Valve Sizes
• Bare, 1/pkg.
  
  

  This head is sold as an unassembled bare casting. It is finished machined and includes valve guides and valve seats installed. This head does NOT include rocker studs, valves, springs, retainers or locks.

  Cylinder Head Specifications
• Intake Port Volume: 335cc - Oval Port
• Combustion Chamber Volume: 119cc
• Valve Sizes: 2.300' Intake / 1.880' Exhaust ( 11/32' Stem Diameter )
• Spark Plug Configuration: Angled
  Facts and Related Components
• Torque Heads: 70 ft-lb.
• Torque Rocker Studs: 40-45 ft-lb.
• Intake Gasket: Brodix p/n 158-MG2104
• Head Gasket: 4.540' Bore - Fel-Pro p/n 375-1017, Cometic p/n 245-C5433; 4.600' Bore - Fel-Pro p/n 375-1057, Cometic p/n 245-C5434
• Exhaust Gasket: Fel-Pro p/n 375-1411 or Cometic p/n 245-C5429
• Head Bolts: ARP p/n 070-135-3606, Manley p/n 660-42192
• Head Studs: ARP p/n 070-235-4702 (12-point)
• Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
• Valve Angle: 24° and 4° Intake, 15° and 4° Exhaust
• Angle Milling: .0066' per cc
• Flat Milling: .0050' per cc
• Pushrod Slots: Standard
• Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
• Stud Girdle: Standard, Brodix p/n 158-1230
• Rocker Arms: Standard
• Lifters: Standard
• Pistons: 2° Valve Rolled Piston
• Exhaust Pattern: Raised .600'
• Spring Pockets: May not be cut any larger or deeper than 1.625'
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix SA 2017 (p/n 158-SA2017) / SA 2027 (p/n 158-SA2027) / BM 2017 (p/n 158-BM2017) / BM 2027 (p/n 158-BM2027)

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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