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12360874
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Big-Block V8 Retainer / Seal Kit
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16 steel valve spring retainers and seals for 1991 and later Gen V & Gen VI big-block engines. New seal design improves oil economy. Replaces early-style retainer with integral oil shield. Valve guide bosses require minor machining with high-lift camshaft.
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Technical Notes: Kit includes 16 retainers P/N 12550421 and seals P/N 12550422.
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12366567
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Valve Spring Kit
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These heavy-duty spring assemblies are made of aircraft quality steel and recommended for big block competition engines. The outer coil diameter is 1.525". The spring yields 128 pounds seat pressure at an installed height of 1.70", and this spring coil binds at 1.26". It's rated at 406 pounds/inch. This kit includes 16 springs of P/N 366282, and use P/N 366282 for single spring replacement. Use steel retainer P/N 366254. This spring requires a small diameter aftermarket PC-type valve stem seal.
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12371061
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Valve Spring Kit
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These high performance springs assembly are used in all 396, 427, and 545 LS6 crate engines. The outer coil diameter is 1.487". The spring yields 105 pounds seat pressure at an installed height of 1.88", and if this spring coil binds at 1.28" it's rated at 450 pounds/inch. This kit includes 16 springs of P/N 3970627, and use P/N 3970627 for single spring replacement. Use steel retainer P/N 3964264.
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12371062
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Valve Spring Kit
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These heavy-duty spring assemblies are made of aircraft quality steel and recommended for big block competition engines. The outer coil diameter is 1.538". The spring yields 128 pounds seat pressure at an installed height of 1.90", and this spring coil binds at 1.26". It's rated at 330 pounds/inch. This kit includes 16 springs of P/N 3989354, and use P/N 3989354 for single spring replacement. Use steel retainer P/N 3989353. This spring requires a small diameter aftermarket PC-type valve stem seal.
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12462970
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Valve Spring
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Valve Spring
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Technical Notes: This high performance valve spring has an outer and inner spring. Used in late model 502 HO engines.
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12495496
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Valve Spring Kit
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This high performance chrome vanadium spring and damper assemby was developed for heavy-duty L88, and ZL1, and LS7 engines. The outer coil diameter is 1.487". The spring yields 116 pounds seat pressure at an installed height of 1.88". Open pressure is 310 pounds at .560 valve lift. This spring coil binds at 1.20". It is rated at 317 pounds/inch. This kit includes 16 springs of P/N 3916164, and use P/N 3916164 for single spring replacement. Use steel retainer P/N 3879613.
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12495514
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Valve Spring Kit
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These high performance spring assemblies are used in all 454 and 502 crate engines. The outer coil diameter is 1.487". The spring yields 110 pounds seat pressure at an installed height of 1.88". This kit includes 16 springs of P/N 14097002, and use P/N 14097002 for single spring replacement. Use steel retainer P/N 14096274.
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12495688
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Valve Spring Cap Kit
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This special machined steel performance valve spring cap kit is used on the 502/502ci engine kit. These spring caps are used with valve spring P/N 12462970 or spring kit P/N 12495691. This kit includes 16 of P/N 12366990. Use P/N 12366990 for single service replacement.
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12495689
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Valve Spring Stem Key Kit
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This special machined steel performance valve spring stem key kit is used on the 502/502ci engine kit. These spring cap keys are used with valve spring cap P/N 12366990 or spring cap kit P/N 12495688. This kit includes 32 keys.
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12495690
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Valve Spring Stem Seal Kit
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This special performance valve spring stem seal kit is used on the 502/502ci engine kit. These spring seals are used with valve spring cap kit P/N 12495688 and valve spring kit P/N 12495691. This kit includes 16 seals.
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12495691
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Valve Spring Kit
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This special performance valve spring kit is used on the 502/502ci engine kit. These springs can be used on any big block Chevrolet engine that requires this valve spring specification. This outer coil spring diameter is 1.514". The spring yields 140 pounds at installed height of 1.940", and this spring coil binds at 1.20". It's rated at 368 pounds/inch. This kit includes 16 of P/N 12462970. Use P/N 12462970 for single service replacement.
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12550421
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Valve Spring Retainer
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For 1991 and later.
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Technical Notes: Use with seal P/N 12550422
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12550422
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Valve Stem Seal
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This seal is for Gen V & Gen VI 1991 and later engines. Use with valve spring cap P/N 12550421.
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Technical Notes: The valve guide boss must be machined slightly to provide adequate seal to retainer clearance when using a high lift camshaft or when used on Mark IV engines.
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14097002
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Valve Spring
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This high performance valve spring has an outer and inner spring. Used in late model 454 and 502 HO engines.
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Technical Notes: The dual spring is 1.487" O.D. diameter 1. The pressure at installed height is 110# @ 1.88". Use with valve spring retainer P/N 14096274.
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3875916
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Spring Shim
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55/64" ID x 131/64" OD x .015" thick.
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3879613
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Steel Valve Spring Retainer
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Retainer and seal for valve spring P/N 3916164.
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3891521
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Spring Shim
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55/64" ID x 131/64" OD x .065" thick.
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3916464
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Valve Spring
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This high performance valve spring has an outer and inner spring with a damper; was originally used in the 427/454 LS7, ZL1, and L-88 Corvettes. Good for mild performance big blocks
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Technical Notes: The dual spring is 1.487" O.D. diameter and 1.10" solid height. The pressure at installed height is 116# @ 1.88" with 317# the average rate of pound per inch. Use with valve spring retainer P/N 3879613.
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3947880
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Valve Spring Key
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These hardened steel split locks are suitable for both production and racing engines. They are color coded purple. 32 required.
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3964264
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Valve Spring Retainer
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Retainer and seal for valve spring P/N 3970627.
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3970627
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Valve Spring
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This high performance valve spring has an outer and inner spring; was originally used in the 454 LS6 Chevelle's in the 1970's. Good for mild performance big blocks.
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Technical Notes: The dual spring is 1.487" O.D. Diameter and 1.28" solid height. The pressure at installed height is 105# @ 1.88" with 450# the average rate of pound per inch. Use with valve spring retainer P/N 3964264.
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3989353
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Steel Valve Spring Retainer
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Retainer for valve spring P/N 3989354.
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3989354
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Valve Spring
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This high performance valve spring has an outer and inner spring with a damper. Used with mild race camshaft.
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Technical Notes: The dual spring is 1.538" O.D. diameter and 1.26" solid height. The pressure at installed height is 128# @ 1.90" with 330# the average rate of pound per inch. Use with valve spring retainer P/N 3989353.
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460527
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Valve Stem Seal
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Umbrella-type stem seal for all big-block Chevrolet V8s.
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