Pro Action Un-Assembled LS1 Cylinder Head w/ .660" Lift Dual Springs

Don't bother searching through junkyards for 243 or 799 casting heads, the RHS Pro Action LS1 Cylinder Head is a better option. Manufactured from premium materials to the industry's tightest tolerances, the RHS Pro Action Cathedral Port Head for GM LS1/LS2/LS6 is a far better option. Compatible with stock components along with COMP Cams premium valvetrain components, the RHS Pro Action Head is ready to bolt on, requiring no milling or clean up like junkyard pieces. Available bare, un-assembled for porting projects as well as pre-assembled, the RHS Pro Action LS1 Cathedral PortCylinder Head is a great choice for your next 4.8, 5.3, 5.7, 6.0 and 6.2 GM LS project!

Additional Attributes:

• GTIN: 00036584405719
• Compatible GM LS Engines (RPO Codes): LS1/LS6/LS2/LQ4/LQ9/LM7/LR4/LM4/L33
• Accessory Bolt Holes Drilled?: Yes
• CNC Ported?: No
• CNC-Machined Exhaust Runner?: No
• CNC-Machined Intake Runner?: No
• Combustion Chamber Volume: 65
• Cylinder Head Finish: As Cast
• Cylinder Head Material: Aluminum
• Exhaust Port Location: Stock
• Exhaust Runner Volume: 75
• Exhaust Valve Diameter: 1.55
• Exhaust Valve Stem Diameter: 8
• Exhaust Valve Length: Stock
• Exhaust Valve Material: Stainless Steel
• Exhaust Valves Included: Yes
• Grade Type: -
• Head Gaskets Included?: No
• Heat Crossover?: No
• Includes Valve Locks?: Yes
• Includes Valve Spring Retainers?: Yes
• Includes Valve Springs?: Yes
• Intake Port Location: Stock
• Intake Port Shape: Cathedral
• Intake Runner Volume: 210
• Intake Valve Angle: 15
• Intake Valve Diameter: 2
• Intake Valve Stem Diameter: 8
• Intake Valve Length: Stock
• Intake Valve Material: Stainless Steel
• Intake Valves Included: Yes
• Machined for O-Ring?: No
• Push Rod Diameter: 5/16
• Rocker Arm Nut Thread Size: -
• Rocker Arm Nuts Included: No
• Rocker Arm Studs Included?: No
• Rocker Arms Included: No
• Spark Plug Style: Tapered or Gasketed
• Valve Guide Material: Bronze
• Valve Guides Included?: Yes
• Valve Guide Outer Diameter: 0.5
• Valve Seat Machine Style: 3 angle
• Valve Seat Material: Powdered Metal
• Valve Seats Machined?: Yes
• Valve Spring Seat Diameter: 1.3
• Valve Springs Included?: Yes
• Valve Spring Diameter: 1.29
• Valve Spring Installed Height: 1.8
• Valve Spring Seat Pressure: 145
• Valve Spring Open Pressure at Max Lift: 463
• Valve Spring Retainer Material: Steel
• Valve Spring Maximum Valve Lift: 0.66
• Valve Stem Seal Type: Viton®
• Valve Stem Seals Included?: Yes
• Flow at 0.100" Valve Lift: N/A
• Flow at 0.200" Valve Lift: N/A
• Flow at 0.300" Valve Lift: N/A
• Flow at 0.400" Valve Lift: N/A
• Flow at 0.450" Valve Lift: N/A
• Flow at 0.500" Valve Lift: N/A
• Flow at 0.550" Valve Lift: N/A
• Flow at 0.600" Valve Lift: N/A
• Flow at 0.650" Valve Lift: N/A
• Flow at 0.700" Valve Lift: N/A
• Chevrolet Parts OE Number: 12564243

Extened Information:

• Emissions : Not in CA
• Life Cycle Status: Available To Order

Packaging:

• Quantity of Each: 1
• Package UOM: EA
• Dimension: 26.25 x 12.5 x 10.5 inches