Pro Action Pre-Assembled LS1 Cylinder Head w/ .660" Lift Dual Springs
  • Pro Action Pre-Assembled LS1 Cylinder Head w/ .660" Lift Dual Springs
  • Pro Action Pre-Assembled LS1 Cylinder Head w/ .660" Lift Dual Springs
  • Pro Action Pre-Assembled LS1 Cylinder Head w/ .660" Lift Dual Springs
Racing Head Service (RHS)

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

Part Number:54240-05HCS
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!
  • Edelbrock products offer improved performance and aesthetics for a broad array of vehicles and engines. 'Proven performance' is the philosophy by which Edelbrock was founded and it continues to this day with the highest standards for performance and quality. Edelbrock core products are engineered, manufactured, and tested in the USA to ensure the best quality possible. This is further backed by some of the best warranties in the industry and a highly qualified technical support staff.
Features
  • SKU
    54240-05HCS
  • Brand
    Racing Head Service (RHS)
  • Accessory Bolt Holes Drilled
    Yes
  • CNC Machined Exhaust Runner
    No
  • CNC Machined Intake Runner
    No
  • CNC Ported
    No
  • Chevrolet OE Number
    12564243
  • Combustion Chamber Volume
    65.0 cc
  • Cylinder Head Material
    Aluminum
  • Engine Fitment
    GM LS1, LS6, LS2, LQ4, LQ9, LM7, LR4, LM4, L33
  • Exhaust Port Location
    Stock
  • Exhaust Runner Volume
    75.0 cc
  • Exhaust Valve Length
    Stock
  • Exhaust Valve Material
    Stainless Steel
  • Exhaust Valve Stem Diameter
    8.0 mm
  • Finish
    As Cast
  • 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
    210.0 cc
  • Intake Valve Angle
    15.0 Degrees
  • Intake Valve Diameter
    2.0 in.
  • Intake Valve Length
    Stock
  • Intake Valve Material
    Stainless Steel
  • Intake Valve Stem Diameter
    8.0 mm
  • Machined for O-Ring
    No
  • Push Rod Diameter
    0.313 in.
  • Spark Plug Style
    Tapered or Gasketed
  • Valve Guide Material
    Bronze
  • Valve Guide Outer Diameter
    0.5 in.
  • Valve Seat Machine Style
    3 Angle
  • Valve Seat Material
    Powdered Metal
  • Valve Seats Machined
    Yes
  • Valve Spring Diameter
    1.29 in.
  • Valve Spring Installed Height
    1.8 in.
  • Valve Spring Maximum Valve Lift
    0.66 in.
  • Valve Spring Open Pressure at Max Lift
    463.0 lbs.
  • Valve Spring Retainer Material
    Steel
  • Valve Spring Seat Diameter
    1.3 in.
  • Valve Spring Seat Pressure
    145.0 PSI
  • Valve Stem Seal Type
    Viton
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