BP -18C Series Cylinder Heads
• Spread Exhaust Port
• 254cc Intake Ports
• 56cc Combustion Chambers
• 2.180'' Intake / 1.625'' Exhaust Valves
• 1.550'' Dia. Springs - 240# Seat Pressure
• Titanium Retainers
• Angle Plug
• Assembled, 2/pkg.
  
  
  Cylinder Head Specifications
• Intake Port Volume: 254cc
• Combustion Chamber Volume: 56cc
• Valves: 2.180' dia. x 5.540' o.a.l. Intake / 1.625' dia. x 5.540' 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: N/A - 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: Modified Fel-Pro p/n 375-1282
• 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-MG52464, Cometic p/n 245-C5424 (Spread Port)
• Head Studs: ARP p/n 070-234-4727 (12-point with 3/8' center studs)
• Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
• Valve Angle: 18°
• Angle Milling: .0065' per cc
• Flat Milling: .0055' per cc
• Pushrod Slots: 58/107
• Stud Girdle: N/A
• Rocker Arms: Shaft System with 58/107 Spacing (Check heads for intake offset) - T&D 2229, Jesel KPS 15409
• Lifters: .180' Offset
• Pistons: Special 18°
• Pushrods: Special Length
• Intake Face Angle: 5°
• Exhaust Pattern: Stahl Only
• Valve Centerline: 58/107
• Spring Pockets: 1.550' Out of the Box, May be cut to 1.625' - No larger or deeper
• Accessory Bolt Holes are Drilled
• Recommended Intake Manifold: Brodix HV 1813 (p/n 158-HV1813) / HV 1814 (p/n 158-HV1814)

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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