-11X Series Cylinder Heads
• Spread Exhaust Port
• 225cc Intake Ports
• 67cc Combustion Chambers
• 2.080'' Intake / 1.600'' Exhaust Valves
• 1.550'' Dia. Springs - 240# Seat Pressure
• Titanium Retainers
• Angle Plug
• Assembled, 2/pkg.
  
  
  Cylinder Head Specifications
• Intake Port Volume: 225cc
• Combustion Chamber Volume: 67cc
• Valves: 2.080' dia. x 5.065' o.a.l. Intake / 1.600' dia. x 5.065' o.a.l. Exhaust ( 11/32' Stem Diameter )
• Valve Springs: 1.550' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950'; Max Lift: .700'
• Spring Retainers: 1.550' 10° Titanium
• Rocker Studs: 7/16'
• Guide Plates: 5/16'
• 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: Fel-Pro p/n 375-1206, Cometic p/n 245-C5414
• Head Gasket: Fel-Pro p/n 375-1003 (350ci) / 375-1004 (400ci) or Cometic p/n 245-C5399 (350ci) / 245-C5403 (400ci)
• Exhaust Gasket: Brodix p/n 158-MG1500 (Spread Port)
• Head Bolts: ARP p/n 070-134-3601 or Manley p/n 660-42313
• Head Bolt Washers: MANLEY p/n 660-42102
• Head Studs: ARP p/n 070-234-4301 (12-point)
• Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
• Valve Angle: 23°
• Angle Milling: .0078' per cc
• Flat Milling: .0060' per cc
• Pushrod Slots: 40/60
• Stud Girdle: 40/60 Brodix p/n 158-BR6440
• Rocker Arms: Standard, T&D Economy 40/60 2256, Jesel 40/60 Shaft System KPS 01302
• Lifters: Standard
• Exhaust Pattern: Standard or Spread Port
• Valve Centerline: 40/60
• Spring Pockets: May not be cut any larger or deeper than 1.550'
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix BM 1000(p/n 158-BM1000) / HV 1000 (p/n 158-HV1000) / HV 1002 (p/n 158-HV1002) / SE 100 (p/n 158-SE100) / SE 102 (p/n 158-SE102)

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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