BP BB-2 XTRA Series Cylinder Head
• CNC Ported
• 355cc Intake Ports
• 119cc Combustion Chambers
• 2.300'' Intake / 1.880'' Exhaust Valves
• 1.625'' Dia. Springs - 255# Seat Pressure
• Titanium Retainers
• Assembled, 1/pkg.
  
  
  Cylinder Head Specifications
• Intake Port Volume: 355cc - Rectangle Port
• Combustion Chamber Volume: 119cc
• Valves: 2.300' dia. x 5.468' o.a.l. Intake / 1.880' dia. x 5.394' o.a.l. Exhaust ( 11/32' Stem Diameter )
• Valve Springs: 1.625' Diameter - Open Pressure: 745 lbs.; Closed Pressure: 255 lbs.; Installed Height: 2.050'; Max Lift: .800'
• Spring Retainers: 1.625' 10° Titanium
• Rocker Studs: 7/16'
• Guide Plates: 3/8'
• Valve Seals: 11/32'
• 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-MG2001, Fel-Pro p/n 375-1252-3, Cometic p/n 245-C5428
• Head Gasket: 4.310' Bore - Fel-Pro p/n 375-1027, Cometic p/n 245-C5432; 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: 26° and 4° Intake, 17° 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: Standard w/BB-2 X, BB-2 XTRA, BP BB-2 XTRA; Check Piston Valve Notches w/BB-3
• Exhaust Pattern: Raised .600'
• Valve Centerline: Standard w/BB-2 X, BB-2 XTRA, BP BB-2 XTRA; Exhaust Valve Moved .300' w/BB-3
• Spring Pockets: May not be cut any larger or deeper than 1.625'
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix HV 2000 (p/n 158-HV2000) / HV 2001 (p/n 158-HV2001)

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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