Assembled Aluminum Cylinder Heads for Oldsmobile V8 350/400 / 425/455 188cc/77cc - Hydraulic Flat Compatible, Springs/Valves/Retainers Installed, Bolt-On Ready Pair - Speedmaster PCE281.2152

Brand:SpeedmasterPart Number:PCE281.2152Part Type:Cylinder Head [Assembled]Product Line:Hydraulic Flat TappetCylinder Head Style:AssembledCylinder Head Material:AluminumCylinder Head Finish:NaturalCombustion Chamber Volume (cc):77 ccCNC-Machined Combustion Chamber:NoIntake Runner Volume (cc):188 ccExhaust Runner Volume (cc):n/aCNC-Machined Intake Runner:NoCNC-Machined Exhaust Runner:NoIntake Port Shape:RectangularIntake Port Location:StandardExhaust Port Shape:SquareExhaust Port Location:StandardSpark Plug Style:OEMComp. Valve Job:NoIntake Valves Included:YesIntake Valve Diameter (in):2.072 in.Exhaust Valves Included:YesExhaust Valve Diameter (in):1.680 in.Valve Springs Included:YesMaximum Valve Lift (in):0.615 in.Outside Diameter of Outer Spring (in):1.450 in.Damper Spring Included:YesNumber of Springs Per Valve:DualRetainers Included:YesRetainer Material:Chromoly steelLocks Included:YesLock Style:10 degreeValve Stem Seals Included:YesValve Stem Seal Style:Positive stopRocker Arm Studs Included:NoRocker Arms Included:NoRocker Arm Nuts Included:NoGuideplates Included:NoValve Cover Mounting Style:Center & Perimeter BoltAccessory Bolt Holes Drilled:YesIntake Valve Angle:18 deg.Exhaust Valve Angle:18 deg.Valve Guides Included:YesValve Guide Material:BronzeValve Seats Machined:YesValve Seat Machine Style:3-angleValve Seat Material:Ductile ironSteam Holes Drilled:NoOiling Style:Through pushrodMachined for O-Ring:NoHeat Crossover:NoQuantity:Sold as a pair.

• [FLOWS BIG, BUILDS POWER] Aluminum 188cc intake runners deliver high-velocity charge for strong mid-range and top-end power on your Oldsmobile V8 - matched to hydraulic flat cam profiles for street/strip builds.
• [FITS Oldsmobile V8 350 / 400 / 425 / 455] Direct bolt-on for standard-deck blocks with stock head bolt pattern. Verify pushrod length and intake manifold port match before final torque.
• [ASSEMBLED & READY] Springs, retainers, locks, valves, valve seals, and guide plates installed. 77cc combustion chambers paired with stainless intake/exhaust valves. Just bolt on, gasket, torque, and run.
• [PREMIUM ALUMINUM CONSTRUCTION] Precision-cast aluminum for weight savings and improved heat dissipation vs cast iron. Hardened seats, machined for stud-mount rockers, ready for high-RPM use.
• [SHIPS AS A PAIR] Set of 2 fully assembled cylinder heads, matched and ready for installation. Head gaskets, head bolts/studs, intake gaskets, and rocker arms sold separately.