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Racing Head Service (RHS)
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Engine Cylinder Head
Engine Intake Manifold
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Racing Head Service (RHS)
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Accessory Bolt Holes Drilled?: Yes
Air and Fuel Delivery
Basic Operating RPM Range: 3000-8000
Bolt Centerline to Port Floor: 1.15
Bolt Hole Centerline to Port Roof: 1.34
Boost Capable?: Yes
Brand Name: Racing Head Service (RHS)
Carb Angle: 0
Carb Height: 7.46
Carb Height: 7.74
Carburetor Mounting Pattern: 4500/Dominator
Center Maximum Height: 7.74
Chevrolet Parts OE Number: 12564243
CNC Ported: No
CNC Ported?: No
CNC-Machined Exhaust Runner?: No
CNC-Machined Intake Runner?: No
Color: Natural
Combustion Chamber Volume: 65
Compatible GM LS Engines (RPO Codes): LS1/LS6/LS2/LQ4/LQ9/LM7/LR4/LM4/L33
Cylinder Head Finish: As Cast
Cylinder Head Material: Aluminum
EGR?: No
Emissions : Not in CA
Emissions : Released
Exhaust Port Location: Stock
Exhaust Runner Volume: 75
Exhaust Valve Diameter: 1.55
Exhaust Valve Length: Stock
Exhaust Valve Material: Stainless Steel
Exhaust Valve Stem Diameter: 8
Exhaust Valves Included: Yes
Finish: Natural
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
Front Maximum Height: 3.09
Fuel Rails
Gasket Or Seal Included: No
Grade Type: -
Grade Type: Performance
Head Gaskets Included?: No
Heat Crossover?: No
Includes Fuel Rails?: No
Includes Fuel Rails?: Yes
Includes Valve Locks?: Yes
Includes Valve Spring Retainers?: Yes
Includes Valve Springs?: Yes
Injectors
Injectors Included?: No
Intake Port Height: 2.49
Intake Port Location: Stock
Intake Port Shape: Cathedral
Intake Port Width: 1.71
Intake Runner Volume: 210
Intake Valve Angle: 15
Intake Valve Diameter: 2
Intake Valve Length: Stock
Intake Valve Material: Stainless Steel
Intake Valve Stem Diameter: 8
Intake Valves Included: Yes
Life Cycle Status: Available To Order
Machined for O-Ring?: No
Material: Aluminum
Mounting Hole Diameter: 7/16 Slotted
Mounting Hole Quantity: 12
Multiport EFI Ready?: No
Multiport EFI Ready?: Yes
Nitrous Bosses?: No
Nitrous Bosses?: Yes
Plenum Volume (including Runners): 268
Plenum Volume (including Runners): 280
Push Rod Diameter: 5/16
QuoteOnly
Rear Maximum Height: 2.64
Rocker Arm Nut Thread Size: -
Rocker Arm Nuts Included: No
Rocker Arm Studs Included?: No
Rocker Arms Included: No
Single Or Dual Plane Type: Single
Spark Plug Style: Tapered or Gasketed
Throttle Body Included?: No
Valve Guide Material: Bronze
Valve Guide Outer Diameter: 0.5
Valve Guides Included?: Yes
Valve Seat Machine Style: 3 angle
Valve Seat Material: Powdered Metal
Valve Seats Machined?: Yes
Valve Spring Installed Height: 1.8
Valve Spring Retainer Material: Steel
Valve Spring Seat Diameter: 1.3
Valve Springs Included?: Yes
Valve Stem Seals Included?: Yes
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