PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

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.

Bring Us Your Talent

Nobody knows automotive like Dale Earnhardt Jr. — so who better to share advice with aspiring auto techs?

View Technician Stories

BLOCK-Module-Asset-MONSTER-CHEVELLE

The BLOCK

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

Learn More

Four Chevrolet Camaro Sports Cars Parked on Display in a Showroom

Connect With Chevrolet Performance

Want to know the latest in Chevrolet Performance news and more? Connect with us via email and social media today.  

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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.