VALVES Intake Valves Part Number Valve Size Stem Size Description 10241743 1.940" 11/32" Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385 and ZZ383/425 12555331 2.000" 11/32" Stock replacement valve used in the 1996 LT4 engine and in our CT400, Fast Burn 385 and ZZ383/425; also in Fast Burn heads 12363757 2.000" 11/32" Stainless steel valves with undercut stems to improve air flow, single groove design, chrome-plated stems to reduce wear, hardened tips to withstand high loads Exhaust Valves Part Number Valve Size Stem Size Description 12550909 1.500" 11/32" Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385 and ZZ383/425 12551313 1.550" 11/32" Stock replacement valve used in the 1996 LT4 engine, and in our CT400, Fast Burn 385 and ZZ383/425; Also in LT4 and Fast Burn heads VALVE SPRINGS Part Number Spring Type Outside Diameter Pressure at Installed Height Solid Height Average Weight (lbs @ in) Retainer Part Number Valve Seal Kit Technical Notes 94666580 Single w/ damper 1.241" 80# @ 1.700" 1.150" 267 — 12511890 Production spring for 350/290 HP engines 330585 Dual 1.379" 140# @ 1.750" 1.150" 325 — 12511890 Use with all moderate lift racing cams 10206040 Single spring 1.300" 85# @ 1.780" 1.260" 373 — N/A 1992–1993 LT1 production Corvette engine 12713265 Single spring 1.320" 101# @ 1.780" 1.220" 332 19301708 N/A CT400, ZZ5, ZZ6, ZZ383, SP383 (Beehive Spring) 19420455 Spring kit 1.320" 101# @ 1.780" 1.220" 332 19301708 N/A Kit of 16 springs P/N 12625033 (Beehive Spring) 10212811 Single spring 1.250" 80# @ 1.700" 1.200" 256 10241744 N/A CT350/350, 350HO engines 19154761 Spring kit 1.250" 80# @ 1.700" 1.200" 256 10241744 N/A Kit of 16 springs P/N 10212811 (see above) Valve Spring Components Part Number Description Technical Notes 10212809 LT4 Valve Spring Shim Lightweight shims as used on 1996 LT4 Corvette special LT service heads and Fast Burn heads. Use with spring P/N 12551483 3875916 Spring Shim 55/64" I.D. x 1-31/64" O.D. x .015" thick 10212810 Valve Stem Seal Used on LT4 and ZZ4 heads as well as Chevrolet Performance Parts head assemblies P/N 19331470, 19331472, and 19300995 12511890 Valve Stem Seal Kit Late-model V-8 seal kit for 11⁄32" diameter valve stems. Includes 8 intake seals, 8 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 HO, 350 Ram Jet and HT383 10045007 Valve Spring Retainer For all ZZ3 series engines; NOTE: When converting ZZ1 or ZZ2 engines to ZZ3 series cap, valve spring shield must be removed and add cap P/N 10045007, seal P/N 10212810. 19171528 LT4 Valve Spring Cap Kit Kit for 5.7L LT4 engines. Includes 16 P/N 19169661 lightweight retainers. Use with spring kit P/N 12495494 and key kit P/N 12495503. Used on ZZ4, Fast Burn LT4 and iron Vortec Bowtie heads 19169661 Heavy Duty Vortec Valve Spring Retainer Fits Fast Burn and Vortec Bowtie cylinder heads. Designed for circle track racing 12495503 Valve Spring Key Kit Kit includes 32 keys of P/N 24503856 for 11/32" valve stems. Use on all Small-Block V-8 engines OVERHAUL GASKET KITS 19201171 Rebuild Gasket Kit - Fits 350 HO, HT383 and Circle Track engine (P/N 19434602) - Includes head gaskets, oil pan gasket set, rear main seal housing gasket, intake manifold gasket set, water outlet gasket, front cover gasket, fuel pump adapter gasket , water pump gaskets, distributor gasket, valve cover gaskets, crankshaft rear main seal 19201172 Rebuild Gasket Kit - Fits Fast Burn 385, ZZ5, SP350, ZZ6, ZZ383, SP383 and Circle Track engine (P/N 19434604) - Includes head gaskets, oil pan gasket set, rear main seal housing gasket, intake manifold gasket set, water outlet gasket, fuel pump adapter gasket, water pump gaskets, distributor gasket, valve cover gaskets, crankshaft rear main seal 158 CHEVROLETPERFORMANCE.COM SMALL-BLOCK COMPONENTS Exhaust Valve Intake Valve
