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Accessory Bolt Holes Drilled?: YesChevrolet Parts OE Number: 12564243CNC Ported?: NoCNC-Machined Exhaust Runner?: NoCNC-Machined Intake Runner?: NoCombustion Chamber Volume: 65Compatible GM LS Engines (RPO Codes): LS1/LS6/LS2/LQ4/LQ9/LM7/LR4/LM4/L33Cylinder Head Finish: As CastCylinder Head Finish: Bare AluminumCylinder Head Material: AluminumEmissions : Legal USEmissions : Not in CAExhaust Port Location: StockExhaust Runner Volume: 75Exhaust Valve Diameter: 1.55Exhaust Valve Length: -Exhaust Valve Length: StockExhaust Valve Material: -Exhaust Valve Material: Stainless SteelExhaust Valve Stem Diameter: 8Exhaust Valve Stem Diameter: 8mmExhaust Valves Included: NoExhaust Valves Included: YesFlow at 0.100" Valve Lift: N/AFlow at 0.200" Valve Lift: N/AFlow at 0.300" Valve Lift: N/AFlow at 0.400" Valve Lift: N/AFlow at 0.450" Valve Lift: N/AFlow at 0.500" Valve Lift: N/AFlow at 0.550" Valve Lift: N/AFlow at 0.600" Valve Lift: N/AFlow at 0.650" Valve Lift: N/AFlow at 0.700" Valve Lift: N/AGM Performance OE Number: N/AGrade Type: -Head Gaskets Included?: NoHeat Crossover?: N/AHeat Crossover?: NoIncludes Valve Locks?: NoIncludes Valve Locks?: YesIncludes Valve Spring Retainers?: NoIncludes Valve Spring Retainers?: YesIncludes Valve Springs?: NoIncludes Valve Springs?: YesIntake Port Location: StockIntake Port Shape: CathedralIntake Runner Volume: 210Intake Valve Angle: 15Intake Valve Diameter: 2Intake Valve Length: -Intake Valve Length: StockIntake Valve Material: N/AIntake Valve Material: Stainless SteelIntake Valve Stem Diameter: 8Intake Valve Stem Diameter: 8mmIntake Valves Included: NoIntake Valves Included: YesLife Cycle Status: AnnouncedLife Cycle Status: Available To OrderLife Cycle Status: Electronically AnnouncedLife Cycle Status: Temporarily UnavailableMachined for O-Ring?: NoPush Rod Diameter: 16-MayPush Rod Diameter: 5/16Rocker Arm Nut Thread Size: -Rocker Arm Nut Thread Size: N/ARocker Arm Nuts Included: NoRocker Arm Studs Included?: NoRocker Arms Included: NoSpark Plug Style: Tapered or GasketedValve Guide Material: BronzeValve Guide Outer Diameter: 0.5Valve Guides Included?: YesValve Seat Machine Style: 3 angleValve Seat Material: Powdered MetalValve Seats Machined?: YesValve Spring Diameter: 1.282/1.077Valve Spring Diameter: 1.29Valve Spring Diameter: N/AValve Spring Installed Height: 1.8Valve Spring Installed Height: N/AValve Spring Maximum Valve Lift: 0.57Valve Spring Maximum Valve Lift: 0.66Valve Spring Maximum Valve Lift: N/AValve Spring Open Pressure at Max Lift: 312Valve Spring Open Pressure at Max Lift: 463Valve Spring Open Pressure at Max Lift: N/AValve Spring Retainer Material: N/AValve Spring Retainer Material: SteelValve Spring Seat Diameter: 1.3Valve Spring Seat Pressure: 145Valve Spring Seat Pressure: 92Valve Spring Seat Pressure: N/AValve Springs Included?: NoValve Springs Included?: YesValve Stem Seal Type: N/AValve Stem Seal Type: Nitrile RubberValve Stem Seal Type: Viton®Valve Stem Seals Included?: N/AValve Stem Seals Included?: Yes