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

Racing Flag

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

BIG-BLOCK INTAKE VALVES


12556317

  • Valve Size: 2.190" / Stem Size: 3/8"
  • Stock replacement valve for Gen-V and Gen-VI 454 and 502 HO engines

12366986

  • Valve Size: 2.190" / Stem Size: 11/32"
  • Stainless-steel valve with undercut chrome-plated stems, single-groove design, hardened tips
  • Used on ZZ454, ZZ427, and the Anniversary Edition 427 crate engines

12366987

  • Valve Size: 2.250"/ Stem Size: 11/32"
  • Stainless-steel valve with undercut chrome-plated stems, single-groove design, hardened tips
  • Used on ZZ502 and ZZ572

BIG-BLOCK EXHAUST VALVES


14097049

  • Valve Size: 1.880" / Stem Size: 3/8"
  • Stock replacement valve for Gen-V and Gen-VI 454 and 502 HO engines

12366988

  • Valve Size: 1.880" / Stem Size: 11/32"
  • Stainless-steel valve with undercut chrome-plated stems, single-groove design, hardened tips
  • Used on ZZ454, ZZ427, and the Anniversary Edition 427 crate engines

88963128

  • Valve Size: 1.880"/ Stem Size: 11/32"
  • Stainless-steel valve with undercut chrome-plated stems, single-groove design, hardened tips
  • Used on ZZ502 and ZZ572

BIG-BLOCK VALVE SPRINGS


88963934

DUAL SPRING

  • Outside Diameter: 1.540"
  • Pressure Installed at Height: 197 lbs. @1.800"
  • Retainer P/N 12366990
  • Valve Seal Kit P/N 88963936
  • Used with 572-/620-HP engines
  • 1 valve spring; order 16 per engine 

19172596

DUAL SPRING

  • Outside Diameter: 1.567"
  • Pressure Installed at Height: 230 lbs. @2.000"
  • Retainer P/N 12366990
  • Valve Seal Kit P/N 88963936
  • Used with 572-/720-HP engines
  • 1 valve spring; order 16 per engine

BIG-BLOCK VALVE SPRING COMPONENTS


12550421

VALVE SPRING RETAINER

  • For 1991 and newer Gen-V and Gen-VI engines

3947880

VALVE SPRING KEY

  • Hardened steel split locks for production and racing engines. Color-coded purple. Sold individually; order 32 per engine.

12550422

VALVE STEM SEAL

  • Seal for 1991 and newer Gen-V and Gen-VI engines. The valve guide boss must be machined slightly for seal to retain clearance when using high-lift cams.

88963936

VALVE SPRING SEAL

  • Use with all 572 engines

3875916

SPRING SHIM

  • 55/64" I.D. x 1 31/64" O.D. x 0.015" thick

88963937

SPRING SHIM

  • Shim for all 572 engines

88963935

VALVE SPRING LOCATOR

  • Valve spring locator for setting the valve spring in the right location on all 572 engines

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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.