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PARTS INTENDED FOR COMPETITION USE ONLY.
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RS-X ALUMINUM SPREAD-PORT CYLINDER HEADS

19431810

RS-X Spread-Port Aluminum Cylinder Head, CNC-ported - Assembled

RS-X Spread-Port Cylinder Head (exhaust)
Chevrolet Performance Engine Components RS-X Spread-Port Cylinder Head intake
RS-X Spread-Port Cylinder Head (combustion chamber)
  • Fully machined and assembled
  • 449cc intake port
  • 161cc exhaust port
  • 70cc combustion chamber
  • 2.450"/1.800" titanium valves with 5/16" stem OD
  • Ovate wire-type beehive valve springs with 1.589" OD (large end)
  • Steel 10-deg. Retainers with 1.115" OD
  • Standard big block exhaust bolt pattern.

19419908

RS-X Spread-Port Aluminum Cylinder Head, CNC-ported - Bare (not shown)
  • Fully machined and assembled
  • 449cc intake port
  • 161cc exhaust port
  • Intake port volume (nominal): 449 cc
  • Exhaust port volume (nominal): 161 cc
  • Chamber volume (nominal0): 70 cc
  • Intake flow: 481 cfm @ 0.787"
  • Exhaust flow: 347 cfm @ 0.787"
  • Rocker bar required
  • Designed for shaft-mount roller rocker arms
  • Designed for 7/16" pushrods
  • Requires custom exhaust headers

19432393

RS-X Spread-Port Aluminum Cylinder Head - Bare (not shown)
  • Un-ported bare head casting
  • Valve seats and guides included, but delivered uninstalled
  • 449cc intake port
  • As-cast ports and chambers
  • Un machined deck
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Future GM Technicians Posing for a Picture with Dale Earnhardt Jr.

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Technician Stories

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The BLOCK

Visit TheBLOCK.com for a behind-the-scenes look at the world of Chevrolet Performance from an enthusiast's point of view.

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.

Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.