Big Duke PB 1803 Series Cylinder Head
• CNC'd Combustion Chambers
• 413cc Oval Intake Ports
• 95cc Combustion Chambers
• 2.450'' Intake / 1.860'' Exhaust Valves
• 1.625'' Dia. Springs - 255# Seat Pressure
• Titanium Retainers
• Assembled, 1/pkg.
  
  
  Cylinder Head Specifications
• Intake Port Volume: 413cc - Oval Port
• Combustion Chamber Volume: 95cc
• Valves: 2.450' dia. x 6.650' o.a.l. Stainless Steel Intake (55° Valve Seat Angle) / 1.860' dia. x 6.550' o.a.l. Stainless Steel Exhaust (55° Valve Seat Angle) ( 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: Shaft System Required
• Guide Plates: N/A
• 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 MG 2013 (p/n 158-MG2013)
• 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 375-1412 or Cometic p/n 245-C5418
• Head Studs: ARP p/n 070-235-4712 (12-point)
• Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
• Valve Angle: 18° and 4° Intake, 9° and 4° Exhaust
• Angle Milling: N/A
• Flat Milling: .0055' per cc
• Pushrod Slots: Standard
• Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
• Rocker Arms: Shaft Mounted System - T&D 3036, Jesel KPS 22797
• Lifters: Standard
• Pistons: 18° x 9° Valve Piston
• Spring Pockets: May not be cut any larger or deeper than 1.750'
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix PM 1803 (p/n 158-PM1803) / PM 1813 (p/n 158-PM1813) / PM 1903 (p/n 158-PM1903) / PM 1913 (p/n 158-PM1913)

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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