Dragon Slayer DS 225 Series Cylinder Head Kit
• 225cc Intake Ports
• 68cc Combustion Chambers
• 1.550'' Dia. Springs - 240# Seat Pressure
• Steel Retainers
  Includes:
• Heads
• Head Bolts
• Intake, Exhaust & Valve Cover Gaskets
  
  
  Kit Contents:
• Heads: 158-1321001
• Head Bolts: 555-83400
• Two Head Gaskets: 555-210040
• Intake Gaskets: 555-210000
• Exhaust Gaskets: 555-210052
• Valve Cover Gaskets: 555-210075
  Cylinder Head Specifications
• Intake Port Volume: 225cc
• Combustion Chamber Volume: 68cc
• Valves: 2.080' dia. x 4.965' o.a.l. Intake / 1.600' dia. x 4.965' 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° Steel
• 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: Fel-Pro p/n 375-1406 or Cometic p/n 245-C5415
• 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: Standard
• Stud Girdle: Standard
• Rocker Arms: Standard (optional, T&D 2256 or Jesel KPS 01001)
• Lifters: Standard
• Exhaust Pattern: Standard
• Valve Centerline: Standard
• 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)

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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