$1289.0 Buy It Now or Best Offer
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Seller Store raceprovenproducts
(1394) 100.0%,
Location: Rialto, California
Ships to: US,
Item: 166943448971
Returns Accepted:ReturnsNotAccepted
Speedmaster:Speedmaster
Type:Cylinder Head Assembly
Manufacturer Part Number:PCE281.2171
Material:Aluminum
Performance Part:Yes
As with all Speedmaster cylinder heads, our Big Block Chevrolet heads are «Gravity Die Cast». This casting process creates a much more uniform and robust cylinder head.These heads are set up for a Solid Roller Cam. Assembly SpecificationsMax Lift: .650Coil Bind: .925Intake Install: 275lbs @ 2.1Exhaust Install: 275lbs @ 2.1Closed Seat Pressure: 210lbsOpen Seat Pressure: 450lbsGrab a set and you’ll be another satisfied Speedmaster – RACE Proven Products customer.We have sold hundreds of sets of Speedmaster heads without a single complaint and the material and casting quality is second to none.Sold as a pair.FREE Ground Shipping in the U.S. 48. Ships directly from Speedmaster’s Rialto CA Warehouse. SpecsBrand:SpeedmasterPart Number:PCE281.2171Part Type:Cylinder Heads Cylinder Head Style:AssembledCylinder Head Material:AluminumCylinder Head Finish:NaturalCombustion Chamber Volume (cc):119 ccCNC-Machined Combustion Chamber:YesIntake Runner Volume (cc):320 ccExhaust Runner Volume (cc):n/aCNC-Machined Intake Runner:NoCNC-Machined Exhaust Runner:NoIntake Port Shape:RectangularIntake Port Location:StandardExhaust Port Shape:RectangularExhaust Port Location:RaisedSpark Plug Style:AngleComp. Valve Job:NoIntake Valves Included:YesIntake Valve Diameter (in):2.250 in.Exhaust Valves Included:YesExhaust Valve Diameter (in):1.880 in.Valve Springs Included:YesMaximum Valve Lift (in):0.650 in.Outside Diameter of Outer Spring (in):1.550 in.Damper Spring Included:YesNumber of Springs Per Valve:DualRetainers Included:YesRetainer Material:Chromoly steelLocks Included:YesLock Style:10 degreeValve Stem Diameter:11/32 in.Valve 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:24 deg.Exhaust Valve Angle:15 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.CalculatorCompression CalculatorHEAD GASKETSDue to the wide combustion chamber needed to fit around the large 2.250/ 1.880 valves, we recommend our PCE348.1004 MLS head gaskets. These gaskets are .041 thick, and fit bore sizes as large as 4.540 on all Mark IV and VI blocks, as well as aftermarket blocks. Felpro 1017 gaskets will also work with these head/ block combos. To install our BBC heads on Mark V blocks, you will need to use our SM5233L and SM5233R Elite Series MLS head gaskets. Alternatively, you can use Victor Reinz # 4918(R) & #4923(L) head gaskets on Mark V blocks with our heads.INTAKE GASKETSThe PCE281.1488 heads work well with our PCE349.1007 rectangle port gaskets. The PCE281.1489 heads require our PCE349.1008 oval port gaskets. If you prefer Felpro gaskets, the PCE281.1488 heads take a 1275 or 1275-5 gasket, depending on the thickness you require.The CNC-ported heads (PCE281.1511 & PCE281.1523) are matched to the Felpro 1275 & 1275-5 gaskets.SPARK PLUGSOur heads require the use of 14mm. x 3/4 reach 5/8 hex gasket seat sparkplugs. Some recommended plugs are; NGK BCPR6ES or R5671A-7, Champion RC12YC, Autolite AR3923 or AR3924. Remember these are for mild street engines. Higher compression or boost requires colder sparkplugs!HEAD BOLTS / STUDSDue to the raised (+.625 ) exhaust port location on our heads, +.100 longer bolts / studs are needed next to each port. Use our PCE279.1005 head stud Kit. ARP #135-3703 12pt. Head bolts, and #235-4303 Head studs work too. If you already have a standard BBC head stud kit and are just looking for the 8 +.100 studs, use our PCE279.1006 or ARP # 235-4306. These heads should be torqued to 65ft.lbs. using high pressure moly lube or 70ft.lbs. using 30wt. oil.Please consult your fastener manufacturer for their specific recommended torque values.EXHAUST GASKETSOur BBC heads utilize a 1.88 x 1.88 square exhaust port. This exhaust port requires specific gaskets. Our PCE355.1003 gaskets are made of re-useable copper, or if you prefer paper, use our pn# SM5123. Felpro also offers gaskets that work with our heads as # 1410.
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