ATK Engines HPSBC220 Aluminum Cylinder Head Specs:

• Material: A356 Aluminum
• Intake Port Volume: 219 cc
• Intake Port Dimension: 2.220 in. H x 1.310 in. W
• Intake Port Location: Stock
• Intake Valve Size: 2.080 in. (8 mm Stem)
• Intake Valve Material: Stainless Steel
• Exhaust Port Volume: 78 cc
• Exhaust Port Dimension: 1.420 in. H x 1.545 in. W
• Exhaust Port Location: Raised .250 in.
• Exhaust Valve Size: 1.600 in. (8 mm Stem)
• Exhaust Valve Material: Stainless Steel
• Combustion Chamber Size: 66 cc
• Valve Cover Bolt Pattern: Perimeter Bolt
• Valve Angle: 23° Degree
• Valve Spring Pocket Diameter: 1.580 in. O.D
• Valve Spring: Dual
• Valve Spring Setup Height: 1.800 in.
• Valve Spring Closed Pressure: 150 lbs (W/Retainer)
• Valve Spring Open Pressure: 1.200 in. .600 in. Lift 390 lbs
• Valve Spring Max Lift: .625 in.
• Valve Guide Material: Manganese Bronze
• Valve Seal Material: Viton
• Valve Seat Material: Powder Metal
• Retainer Material: Steel with 7° Bead Lock Keepers
• Deck Thickness: .750 in.
• Minimum Bore Diameter: 4.000 in.
• Flat Mill: .006 in. per cc 60 cc Max
• Spark Plug Dimensions: 14 mm x .750 in. with Gasket Seat
• Torque Specifications: Per Application Based on Factory or Aftermarket Bolts/Studs

ATK Engines HPSBC220 Recommended Components:

• Intake Port Gasket: Fel Pro 1207
• Exhaust Port Gasket: Per Application
• Head Gasket 350CI: Fel Pro 1003 / 400CI Fel Pro 1014
• Head Bolts: ARP 134-3701
• Head Studs: ARP 234-4301
• Spark Plug Starting Range: Autolite 3923 or Per Application
• Lifters: Factory Hyd. Roller Lifters or Per Application
• Pushrods: Per Application (must check length)
• Rocker Arms: Aftermarket Roller Rockers

ATK Engines HPSBC220 Aluminum Cylinder Head Flow Data:

• Flow Tested on a Super Flow SF600 bench with a 4.030” bore size @28” water. Clay intake radius was used, Flow tube was not used on the exhaust port

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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