Racing Flag

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

Racing Flag

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

LS/LT/LSX PRODUCTION AND C5R ALUMINUM HEADS

12629062

L92 CYLINDER HEAD ASSEMBLY 

  • Aluminum performance head
  • Fits any LS-family engine with 4.000" bore or larger
  • 2.165" solid-stem intake and 1.590" solid-stem exhaust valves
  • .510" max valve lift
  • As-cast L92-style intake ports
  • D-shaped exhaust ports
  • As-cast combustion chambers

12629063

LS3 CYLINDER HEAD ASSEMBLY 

  • Aluminum performance head
  • Fits any LS-family engine with 4.000" bore or larger
  • 2.165" hollow-stem intake and 1.590" solid-stem exhaust valves
  • .550" max valve lift
  • As-cast L92-style intake ports
  • D-shaped exhaust ports
  • As-cast combustion chambers

88958758

LS3 CNC-PORTED CYLINDER HEAD ASSEMBLY

  • CNC-ported version of the LS3 cylinder head
  • Flows about 10 percent more than the production head
  • More than 350 cfm (intake side) at .600" lift
  • 276-cc intake runners and 92-cc exhaust ports
  • Fits all LS engines with 4.000" bore or larger
  • 2.165" hollow-stem intake and 1.590" solid-stem exhaust valves
  • .550" max valve lift
  • D-shaped exhaust ports

19328743

LS9 CNC-PORTED HEAD ASSEMBLY

  • Special A356T6 aluminum roto-cast head casting for greater strength. The mold is rotated during production to create a stronger casting with improved mechanical properties.
  • Reinforced webbing and thicker deck (for minimal distortion) make it an excellent choice for supercharged and turbocharged engine combinations
  • CNC-ported for approximately 10 percent greater airflow (intake side) than the regular production cylinder head (similar to LS3 CNC-ported head P/N 88958758)
  • As-cast 66.5-cc combustion chamber volume
  • Fully assembled with production LS9 2.165" (55 mm) titanium intake valves and sodium-filled 1.590" (40 mm) exhaust valves and beehive-type valve springs
  • Valve springs rated for .570" max lift
  • Can be used on LS engines with at least a 4.000" bore using standard 11 mm head bolts in place of the LS9’s 12 mm head bolts

12578449

LS7 CNC-PORTED CYLINDER HEAD ASSEMBLY

  • 356-T6 aluminum head
  • Fully CNC’d ports and chambers
  • LS7 rectangle port design
  • Assembled with 2.200" titanium intake and 1.610" sodium-filled exhaust valves
  • 12° valve angle
  • Minimum 4.100" bore
  • 270-cc CNC’d intake ports, 85-cc CNC’d exhaust ports
  • 70-cc CNC’d combustion chambers
  • Capable of over 600 horsepower
  • Bare head available separately

12626958

LSA CYLINDER HEAD ASSEMBLY

  • CTS-V and ZL1 6.2L production cylinder head assembly
  • High-strength aluminum casting for supercharged application
  • Premium steel intake and exhaust valves
  • Completely assembled

25534393

BARE C5R RACING CUBED CYLINDER HEAD

  • The images represent a machined version of the cubed (unmachined) product. Chevrolet Performance does not supply a fully machined version of the C5R head. Image is for reference only.
  • 355-T7 “as-cast” aluminum racing head
  • Professional porting and machining of combustion chambers required
  • No seats or guide machining
  • C5R rectangle-port design – requires aftermarket rectangle-port intake manifolds
  • Designed for big-bore (4.100" min) LS7/C5R/LSX blocks
  • 210-cc “as-cast” intake ports
  • 70-cc “as-cast” exhaust ports, same as production LS6
  • 30-cc “as-cast” combustion chambers
  • All fasteners are metric
  • Capable of 800+ horsepower
  • Standard LS exhaust port design

12678972

LT1 CYLINDER HEAD ASSEMBLY

  • Replacement for production cylinder head assembly
  • Fully assembled  
  • Machined for direct fuel injection

19329839

LT1 CNC CYLINDER HEAD ASSEMBLY

  • Fully assembled
  • Machined for direct fuel injection
  • CNC machine-ported intake and exhaust runners
  • Included in Head and Hot Cam Kit  

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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.

  • CHEVROLET PERFORMANCE PARTS COMPLIANCE WITH EMISSIONS STANDARDS

    Motor vehicle emissions standards are intended to help achieve and maintain air quality goals that benefit human health and the environment. U.S. federal and state and Canadian law prohibits knowingly removing, modifying, or making inoperative, or causing someone to remove or render inoperative, or otherwise tampering with, any part or element of design installed in compliance with motor vehicle emission standards on a motor vehicle or nonroad vehicle, or otherwise modifying any required emission and noise control system. Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet emissions laws and regulations and should not be operated on public roads or used for any other use. This part is intended primarily for use in vehicles that are NOT:

    (1) “motor vehicles” designed for street use; or

    (2) off-road vehicles used for anything but competition.

    U.S. federal and state, and Canadian provincial agencies have the authority to administer substantial monetary penalties against individuals and companies who do not comply with these laws. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance Parts complies with applicable federal, state/provincial and local laws, regulations and ordinances, and for ensuring that modified vehicles are operated in a manner that complies with applicable laws. In an effort to help consumers maintain compliance with emissions regulations, the product descriptions for many parts include emissions-related warnings and notices. This page summarizes the emissions-related information that you may see on this website.

    PARTS INTENDED FOR COMPETITION USE ONLY

    Chevrolet Performance offers parts that are intended exclusively for use in competition vehicles that will only be driven on a track or off-road course. By “competition vehicles,” GM means vehicles (i) used exclusively for competitions organized and sanctioned by a local or private body and (ii) not designed for use on public streets or highways. Consumers are strongly advised not to install parts accompanied by this warning on vehicles that will be driven on public roads, as they are not designed for that purpose. The product descriptions for such parts are accompanied by the “Checkered Flag” warning icon.

    WARNING: NOT EMISSIONS LEGAL FOR STREET USE

    Because of their effect on a vehicle’s emissions performance, certain parts are intended exclusively for use in competition vehicles. The “Checkered Flag” warning icon means a part is designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Installation or use of this part on a vehicle operated on public streets or highways is likely to violate U.S., Canadian, and state and provincial laws and regulations relating to motor vehicle emissions.