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Racing Head Service (RHS) 12303-01 - RHS Pro Action Small Block Chevrolet Cylinder Heads

  • Cylinder Head, Pro Action, Cast Iron, Assembled, 72cc Chamber, 200cc Intake Runner, Chevy, Small Block, Each
  • Application Specific
  • Estimated Ship Date: 6/11/2012
 
BrandRacing Head Service (RHS)
Manufacturer's Part Number12303-01
Part TypeCylinder Heads
Product LineRHS Pro Action Small Block Chevrolet Cylinder Heads
Summit Racing Part NumberRHS-12303-01
UPC036584135432
 
Cylinder Head StyleAssembled
Cylinder Head MaterialCast iron
Cylinder Head FinishNatural
Combustion Chamber Volume (cc)72
CNC-Machined Combustion ChamberNo
Intake Runner Volume (cc)200cc
Exhaust Runner Volume (cc)74cc
CNC-Machined Intake RunnerNo
CNC-Machined Exhaust RunnerNo
Intake Port ShapeRectangular
Intake Port LocationStandard
Exhaust Port ShapeRectangular
Exhaust Port LocationStandard
Spark Plug StyleStraight
Intake Valves IncludedYes
Intake Valve Diameter (in)2.020 in.
Exhaust Valves IncludedYes
Exhaust Valve Diameter (in)1.600 in.
Valve Springs IncludedYes
Maximum Valve Lift (in)0.560 in.
Outside Diameter of Outer Spring (in)1.460 in.
Damper Spring IncludedYes
Number of Springs Per ValveSingle
Retainers IncludedYes
Retainer MaterialSteel
Locks IncludedYes
Lock Style7 degree
Valve Stem Seals IncludedYes
Valve Stem Seal StyleViton®
Rocker Arm Studs IncludedYes
Rocker Arm Nut Thread Size3/8-24 in.
Rocker Arms IncludedNo
Rocker Arm Nuts IncludedNo
Guideplates IncludedYes
Guideplate Pushrod Size5/16 in.
Valve Cover Mounting StylePerimeter bolt
Accessory Bolt Holes DrilledYes
Intake Valve Angle23
Exhaust Valve Angle23
Valve Guides IncludedYes
Valve Guide MaterialBronze
Valve Seats MachinedYes
Valve Seat Machine Style4-angle intake/4-angle exhaust
Steam Holes DrilledNo
Oiling StyleThrough pushrod
Machined for O-RingNo
Heat CrossoverNo
QuantitySold individually.
NotesSteam holes must be drilled on 400 c.i.d. engines.
CalculatorCompression Calculator
 

Pro Action cylinder heads by RHS deliver exceptional performance gains for all small block Chevy owners. They come available in both aluminum and cast iron and in a wide variety of intake runner and combustion chamber volumes. Pro Action small block Chevrolet cylinder heads feature straight or angled spark plug configurations, accept valve spring diameters up to 1.550 in., and work with all popular small block Chevy valvetrain components.

Additional features include:

* Multi-angled intake valve seats
* Radius exhaust valve seats
* Improved valve guide design
* Highly efficient water jacket
* Manganese intake valve guides
* Bronze exhaust valve guides
* Hardened valve seats
* Extra-thick deck faces


Application

Results 1-4 of 4

 
MakeCHEVROLET
Beginning Year1962
Ending Year1969
Liter5.4
CID327
Engine TypeV8
Engine Size5.4L/327
Engine FamilyChevy small block Gen I
Rocker Arm Mounting Style (application)Stud
CalculatorCompression Calculator
 
 
MakeCHEVROLET
Beginning Year1967
Ending Year1969
Liter5.0
CID302
Engine TypeV8
Engine Size5.0L/302
Engine FamilyChevy small block Gen I
Rocker Arm Mounting Style (application)Stud
CalculatorCompression Calculator
 
 
MakeCHEVROLET
Beginning Year1967
Ending Year1986
Liter5.7
CID350
Engine TypeV8
Engine Size5.7L/350
Engine FamilyChevy small block Gen I
Rocker Arm Mounting Style (application)Stud
CalculatorCompression Calculator
 
 
MakeCHEVROLET
Beginning Year1970
Ending Year1980
Liter6.6
CID400
Engine TypeV8
Engine Size6.6L/400
Engine FamilyChevy small block Gen I
Rocker Arm Mounting Style (application)Stud
CalculatorCompression Calculator
 

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