Chevy Small block V8
Valves and Valve Springs Cylinder Head Gaskets & Head Bolts Continued
12553160
LT1 Head Gasket (not shown)
• Composition gasket for 1994–2001 iron head LT1 engines
• 0.028" compressed thickness 10168457
LT1 Head Gasket (Aluminum Head) (not shown)
• Composition gasket for 1992–2001 aluminum head LT1 engines
•
0.050" compressed thickness 12551488
LT4 Head Gasket (not shown)
• Composition gasket for 1996 aluminum head LT4 engines
• 0.043" compressed thickness  A. 12499223
Cylinder Head Installation Kit (5.7L L31 Engine)
• Comprehensive kit
• Includes two cylinder head gaskets, two valve cover gaskets, two intake manifold gasket sets and two exhaust manifold gaskets
HEAD BOLTS AND STUDS
 B. 585927
Cylinder Head Dowel Pin
• Dowel pin 5/16" diameter by 9/16" long
• For all small-block V-8 and 90 V-6 engines
C. 12495499
Cylinder Head Bolt Kit
• For iron or aluminum heads
• Includes 14 of P/N 10168525, 4 of P/N 10168526, 16 of P/N 1016852, and thread sealant
 D. 14011040
Hardened Washer
• 0.45" I.D. x 0.778" O.D.
• Sold individually
E. 10051155
Hardened Washer
• 0.45" I.D. x 0.750" O.D.
• For Phase 6 and raised runner aluminum heads
• Sold individually 12366568
Cylinder Head Nut Kit (not shown)
• Set of 16 magnafluxed 1038 steel 7/16-20 hex head P/N 3942410 nuts for aftermarket head studs
• Complete for one cylinder head. Order two per engine. 12366569
Cylinder Head Nut Kit (not shown)
• Set of 16 magnafluxed 4037 steel 7/16-20 12-point P/N 14044866 nuts for aftermarket head studs
• Complete for one cylinder head. Order two per engine.  F. 3942410
Cylinder Head Stud Nut
• Magnafluxed hex head 1038 steel 7/16-20 nut
• Sold individually
G. 14044866
Cylinder Head Stud Nut
• Magnafluxed 12-point 4037 steel 7/16-20 nut
• Sold individually 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
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 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 N/A 1992–1993 LT1 production Corvette engine
12551483 Single spring 1.32" 101# @ 1.78" 1.22" 332 10212808 N/A 1996 LT4 Corvette, ZZ4, and CT 350/400 engines; not for cams with lift over 0.525"
12495494 Spring kit 1.32" 101# @ 1.78" 1.22" 332 10212808 N/A Kit of 16 springs P/N 12551483 (see above)
10212811 Single spring 1.25" 80# @ 1.70" 1.20" 256 10241744 N/A CT 350/350, 350HO engines
19154761 NEW Spring kit 1.25" 80# @ 1.70" 1.20" 256 10241744 N/A Kit of 16 Springs P/N 10212811 (see above) | 
