Page 157 of GM Performance Parts 2006 Catalog by GM Parts Direct

155 SMALL-BLOCK VALVE SPRINGS Part Spring Outside Pressure at Solid Average Retainer Valve Technical Number Type Diameter Installed Height Height Rate Part Seal Notes (lbs in) Number Kit 3911068 Single 1.241" 80# 1.70" 1.15" 267 14003715 10132715 Production spring for 350/300 hp and 350/290 hp engines w/damper 3927142 Single 1.273" 110# 1.70" 1.16" 358 14003974 10132715 Use with cam P/N 3927140 and all high-performance w/damper production cams to extend rpm range 10134358 Single 1.273" 110# 1.70" 1.16" 356 14003974 10132715 Chrome silicone steel; use with aluminum heads w/damper P/N 10185086; orange color code. 330585 Dual 1.379" 140# 1.75" 1.15" 325 330586 10132715 Use with cams P/N 3927140, P/N 3965754, and all moderate lift racing cams 12495495 Dual Kit 1.379" 140# 1.75" 1.15" 325 330586 10132715 Kit of 16 springs P/N 330585 (see above) 366282 Dual w/damper 1.525" 128# 1.70" 1.26" 406 366254 Aftermarket Use with high-lift mushroom or roller lifter racing cams (0.625" lift) 10206040 Single Spring 1.30" 85# 1.78" 1.26" 373 10168424 NA 1992-1993 LT1 production Corvette engine 12551483 Single Spring 1.32" 101# 1.78" 1.22" 332 10212808 NA 1996 LT4 Corvette and ZZ4 engines; not for cams with lift over 0.525" 12495494 Single 1.32" 101# 1.78" 1.22" 332 10212808 NA Kit of 16 springs P/N 12551483 (see above) Spring Kit 2.02" Intake Valve 1.55" Exhaust Valve SMALL-BLOCK VALVES Part Number Valve Size Stem Size Description Intake Valves 12550909 1.94" 11/32" Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385 ZZ383/425 12363755 1.94" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads 12555331 2.00" 11/32" Stock replacement valve used in the 1996 LT4 engine, and in our CT350/400, Fast Burn 385 ZZ383/425 also in LT4 and Fast Burn heads 12363757 2.00" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads 25534407 2.00" 11/32" Heavy-duty stainless steel one-piece valve, for Bowtie Vortec cylinder heads 12363753 2.02" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads 366285 2.05" 11/32" Swirl polished stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads, 10 back angle Exhaust Valves 10241743 1.50" 11/32" Stock replacement valve used in all of our crate engines except CT350/400, Fast Burn 385 ZZ383/425 12551313 1.55" 11/32" Stock replacement valve used in the 1996 LT4 engine, and in our CT350/400, Fast Burn 385 ZZ383/425 also in LT4 and Fast Burn heads 12363756 1.50" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads 12363758 1.55" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads 12363754 1.60" 11/32" Stainless steel valve with undercut stems to improve air flow, single groove design, chrome plated stems to reduce wear, hardened tips to withstand high loads

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