ATK Engines HPBBC315 Aluminum Cylinder Head Specs:

• Material: A356 Aluminum
• Intake Port Volume: 315 cc Rectangle Port
• Intake Port Dimension: 2.450 in. H x 1.755 in. W
• Intake Port Location: Stock
• Intake Valve Size: 2.25 in.
• Intake Valve Material: Stainless Steel
• Exhaust Port Volume: 124 cc
• Exhaust Port Dimension: 1.780 in. H x 2.031 in. W
• Exhaust Port Location: .375 in. Raised
• Exhaust Valve Size: 1.88 in.
• Exhaust Valve Material: Stainless Steel
• Combustion Chamber Size (As Cast): 120 cc
• Valve Cover Bolt Pattern: Perimeter Bolt
• Valve Angle: Stock
• Valve Spring Pocket Diameter: 1.728 in. O.D
• Valve Spring: Dual w/ Dampener
• Valve Spring Setup Height: 2.000 in.
• Valve Spring Closed Pressure: 160 lbs (W/Retainer)
• Valve Spring Open Pressure: 1.400 in. .600 in. Lift 400 lbs / 1.350 in. .650 in. Lift 425 lbs (W/Retainer)
• Valve Spring Max Lift: .675 in.
• Valve Guide Material: Manganese Bronze
• Valve Seal Material: Viton
• Valve Seat Material: Powder Metal
• Retainer Material: Steel with 10° Locks
• Deck Thickness: .750 in.
• Minimum Bore Diameter: 4.250 in.
• Flat Mill: .006 in. per cc
• Spark Plug Dimensions: 14 mm x .708 in. with Gasket Seat
• Torque Specifications: Per Application Based on Factory or Aftermarket Bolts/Studs

ATK Engines HPBBC315 Recommended Components:

• Intake Port Gasket: Fel Pro 1275-5
• Exhaust Port Gasket: Per Application
• Head Gasket (Factory Block): Fel Pro 508SD or 1017-1
• Head Bolts: ARP 135-3607
• Head Studs: ARP 235-4103
• Spark Plug Starting Range: Autolite 3923 as starting point
• Lifters: Per Application
• Pushrods: 3/8 in. Pushrods are recommended (must check length)
• Rocker Arms: We suggest an aftermarket full roller based on application

ATK Engines HPBBC315 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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