Racing Flag

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

Racing Flag

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

SMALL-BLOCK INTAKE VALVES

10241743

  • Valve Size: 1.940˝
  • Stem Size: 11/32˝
  • Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385, and ZZ383/425

12555331

  • Valve Size: 2.000˝
  • Stem Size: 11/32˝
  • Stock replacement valve used in the 1996 LT4 engine, in our CT400, Fast Burn 385, and ZZ383/425, and in LT4 and Fast Burn heads

12363757

  • Valve Size: 2.000˝
  • Stem Size: 11/32˝
  • Stainless-steel valves with undercut stems to improve airflow, single-groove design, chrome-plated stems to reduce wear, and hardened tips to withstand high loads

SMALL-BLOCK EXHAUST VALVES

12550909

  • Valve Size: 1.500˝
  • Stem Size: 11/32˝
  • Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385, and ZZ383/425

12551313

  • Valve Size: 1.550˝
  • Stem Size: 11/32˝
  • Stock replacement valve used in the 1996 LT4 engine; in our CT400, Fast Burn 385, and ZZ383/425; and in LT4 and Fast Burn heads

SMALL-BLOCK VALVE SPRINGS

94666580

SINGLE WITH DAMPER

  • Outside Diameter: 1.241˝
  • Pressure at Installed Height: 80 lbs. @ 1.700˝
  • Solid Height: 1.150˝
  • Average Weight (lbs @ in): 267
  • Retainer Part Number: 14003715
  • Valve Seal Kit: 10132715
  • Production spring for 350-/290-HP engines

10134358

SINGLE WITH DAMPER

  • Outside Diameter: 1.273˝
  • Pressure at Installed Height: 110 lbs. @ 1.700˝
  • Solid Height: 1.160˝
  • Average Weight (lbs @ in): 356
  • Retainer Part Number: 14003974
  • Valve Seal Kit: 10132715
  • Chrome silicone steel; use with aluminum heads P/N 12556463; orange color code

330585

DUAL

  • Outside Diameter: 1.379˝
  • Pressure at Installed Height: 140 lbs. @ 1.750˝
  • Solid Height: 1.150˝
  • Average Weight (lbs @ in): 325
  • Valve Seal Kit: 10132715
  • Use with cam P/N 3927140 and all moderate-lift racing cams

10206040

SINGLE SPRING

  • Outside Diameter: 1.300˝
  • Pressure at Installed Height: 85 lbs. @1.780˝
  • Solid Height: 1.260˝
  • Average Weight (lbs @ in): 373
  • Retainer Part Number: 10168424
  • Valve Seal Kit: N/A
  • 1992–1993 LT1 production Corvette engine

12625033

SINGLE SPRING

  • Outside Diameter: 1.320˝
  • Pressure at Installed Height: 101 lbs. @1.780˝
  • Solid Height: 1.220˝
  • Average Weight (lbs @ in): 332
  • Retainer Part Number: 19301708
  • Valve Seal Kit: N/A
  • CT400, ZZ5, and ZZ383 engines (Beehive Spring)

12499224

SPRING KIT

  • Outside Diameter: 1.320˝
  • Pressure at Installed Height: 101 lbs. @1.780˝
  • Solid Height: 1.220˝
  • Average Weight (lbs @ in): 332
  • Retainer Part Number: 19301708
  • Valve Seal Kit: N/A
  • Kit of 16 springs P/N 12625033 (Beehive Spring)

10212811

SINGLE SPRING

  • Outside Diameter: 1.250˝
  • Pressure at Installed Height: 80 lbs. @1.700˝
  • Solid Height: 1.200˝
  • Average Weight (lbs @ in): 256
  • Retainer Part Number: 10241744
  • Valve Seal Kit: N/A
  • CT350/350, 350 HO engines

19154761 

SPRING KIT

  • Outside Diameter: 1.250˝
  • Pressure at Installed Height: 80# lbs. @1.700˝
  • Solid Height: 1.200˝
  • Average Weight (lbs @ in): 256
  • Retainer Part Number: 10241744
  • Valve Seal Kit: N/A
  • Kit of 16 Springs P/N 10212811

19300952

BEEHIVE SPRING CONVERSION KIT

Convert the valvetrain on your aluminum Fast Burn heads to the beehive-type system used on Chevrolet Performance’s latest Fast Burn heads (P/N 19300955) — and used on the SP350, ZZ5, ZZ6, SP383, and ZZ383 crate engines and the CT400 — to gain greater high-rpm capability and valvetrain stability. The springs, retainers, and other hardware are direct replacements for the conventional springs and hardware, with no machining of the valve spring seat required. The engine’s existing intake and exhaust valves are retained, allowing installation without cylinder head removal if compressed air or another method is used to hold the valves closed. The engine’s existing rocker arms are also retained. The kit comes with components to convert a pair of cylinder heads, including:

  • 16 Springs
  • 16 Caps
  • 16 Seats
  • 16 Keepers

NOTE: The conversion kit is intended only for Fast Burn heads and is not compatible with Vortec heads because of insufficient room for the spring seats.


SMALL-BLOCK VALVE SPRING COMPONENTS

10212809

LT4 VALVE SPRING SHIM

  • Lightweight shims as used on 1996 LT4 Corvette special LT service heads P/N 12363287 and Fast Burn heads
  • Use with spring P/N 12551483

10185066

SPRING SHIM

  • Used on ZZ3-series 350 HO engines
  • Spacer is 1.350" O.D. x 0.561" I.D. x .050" thick

3875916

SPRING SHIM

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

10212810

VALVE STEM SEAL

  • Used on LT4 and ZZ4 heads as well as Chevrolet Performance Parts head assemblies P/N 25534421, 25534431, 12363287, and 12464298

12511890

VALVE STEM SEAL KIT

  • Late-model V-8 seal kit for 11/32" diameter valve stems
  • Includes eight intake seals, eight exhaust seals, and 16 oil stem seals

NOTE: Check for seal-to-guide interference with high-lift cams.


10241744

VALVE SPRING RETAINER

  • Used on 350 HP, 350 Ram Jet, and HT383

10045007

VALVE SPRING RETAINER

  • For all ZZ3 series engines

NOTE: When converting ZZZ, ZZ1 or ZZ2 engines to ZZ3 series cap, valve spring shield must be removed and add cap P/N 10045007, seal P/N 460483, and spacer P/N 10185066


19171528

LT4 VALVE SPRING KIT

  • Used on ZZ4, Fast Burn, LT4, and Iron Vortec Bowtie heads
  • Kit for 5.7L LT4 engines. Includes 16 P/N 10212808 lightweight retainers.
  • Use with spring kit P/N 12495494 and key kit P/N 12495503

19169661

HEAVY-DUTY VORTEC VALVE SPRING

  • Fits Fast Burn and Vortec Bowtie cylinder heads
  • Designed for Circle Track racing

12495503

VALVE SPRING KEY KIT

  • Use on all Small-Block V-8 engines
  • Kit includes 32 keys of P/N 24503856 for 11/32" valve stems

Email Sign-Up 


Subscribe to receive monthly email communications such as news, offers, and more from Chevrolet Performance.

The BLOCK


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

Connect


Connect with Chevy Performance.

Email Sign-Up 


Subscribe to receive monthly email communications such as news, offers, and more from Chevrolet Performance.

The BLOCK


Check out Chevrolet Performance product releases, future car builds, and more.

Connect


Connect with Chevy Performance.

VISIT OUR BRANDS FOR YOUR OE NEEDS

|

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.