ATK HPSBC220 SBC 66cc/220cc Cylinder Heads Assembled (Each)

Description

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

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

Disclaimer: It’s up to the installer to verify all fitment and components will work on the engine. Everything listed is just a recommendation. ATK is not responsible for damage to heads or engines due to miss matched components or wrong application.

These cylinder heads are 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.