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GM Performance 12558060 - GM Performance Vortec Cylinder Heads

  • Cylinder Head, Vortec, Cast Iron, Assembled, 64cc Chamber, 170cc Intake Runner, Chevy, Small Block, Each
  • Application Specific
  • Savings
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  • Estimated Ship Date: Today
 
BrandGM Performance
Manufacturer's Part Number12558060
Part TypeCylinder Heads
Product LineGM Performance Vortec Cylinder Heads
Summit Racing Part NumberNAL-12558060
 
Cylinder Head StyleAssembled
Cylinder Head MaterialCast iron
Cylinder Head FinishNatural
Combustion Chamber Volume (cc)64
CNC-Machined Combustion ChamberNo
Intake Runner Volume (cc)170cc
CNC-Machined Intake RunnerNo
CNC-Machined Exhaust RunnerNo
Intake Port LocationStandard
Exhaust Port ShapeSquare
Exhaust Port LocationStandard
Spark Plug StyleStraight
Intake Valves IncludedYes
Intake Valve Diameter (in)1.940 in.
Exhaust Valves IncludedYes
Exhaust Valve Diameter (in)1.500 in.
Valve Springs IncludedYes
Outside Diameter of Outer Spring (in)1.250 in.
Damper Spring IncludedNo
Number of Springs Per ValveSingle
Retainers IncludedYes
Retainer MaterialSteel
Locks IncludedYes
Lock Style7 degree
Valve Stem Seals IncludedYes
Valve Stem Seal StyleUmbrella
Rocker Arm Studs IncludedYes
Rocker Arm Nut Thread Size3/8-24 in.
Rocker Arms IncludedNo
Rocker Arm Nuts IncludedNo
Guideplates IncludedNo
Accessory Bolt Holes DrilledYes
Valve Guides IncludedYes
Valve Guide MaterialBronze
Valve Seats MachinedNo
Valve Seat MaterialSteel
Steam Holes DrilledNo
Oiling StyleThrough pushrod
Machined for O-RingNo
Heat CrossoverNo
QuantitySold individually.
NotesRequires Vortec-style intake manifold for installation.
CalculatorCompression Calculator
 

These cast iron Vortec cylinder heads will fit 1958 and later small block Chevy engines, and offer a 20 to 40 HP increase over earlier cast iron small block heads. Features include 64cc fast burn combustion chambers, 170cc intake runners, and a high-velocity LT1 port design. They require the use of a Vortec-style intake and self-aligning rocker arms, and come complete with 1.94 in. intake/1.50 in. exhaust valves, springs, and retainers.

Warranty

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