CYLINDER HEAD GAsKET AND BOLT KITs Part Number Description Technical Notes 12498544 Cylinder Head Gasket Kit (not shown) 2 head gaskets for 1997–2001 LS1 Camaro/Firebird and Corvette engines; Also fits 2001 LS6 Corvette engine 19170418 LSX 4.100 Bore MLS Head Gasket Kit Multi-layer steel gaskets for naturally aspirated and forced induction applications; 0.051" thick; Includes 1 LH and 1 RH gasket; For standard LS and LSX 6-bolt pattern blocks and heads; For bores up to 4.100" 19170419 LSX 4.200 Bore MLS Head Gasket Kit (not shown) Multi-layer steel gaskets for naturally aspirated and forced induction applications; 0.051" thick; Includes 1 LH and 1 RH gasket; For standard LS and LSX 6-bolt pattern blocks and heads; For bores up to 4.200" 19170420 LSX 4.250 Bore MLS Head Gasket Kit (not shown) Multi-layer steel gaskets for naturally aspirated applications; 0.051" thick; Includes 1 LH and 1 RH gasket; For standard LS and LSX 6-bolt pattern blocks and heads; For bores up to 4.250" 12498545 Cylinder Head Bolt Kit (1997-2003, not shown) Kit of 15 head bolts for 1998–2003 LS1 Camaro/Firebird 1997–2003 Corvette and 2001–2003 LS6 Corvette; 1 kit per cylinder head; Order 2 per engine; Head bolts cannot be reused on these engines NOTE: IMPORTANT! LS-Series engines produced from January 2004 forward have a new “short-style” head bolt design. Earlier head bolts will not fit. Order P/N 17800568 for engines produced from January 2004 and later. 17800568 Cylinder Head Bolt Kit, Gen III and Gen IV (not shown) Kit of 15 bolts for LS-Series engines produced from January 2004 and later; Bolts are 5mm shorter than previous design; Services single engine head only 19257453 Cylinder Head Bolt Kit – Std. Deck LSX Block (not shown) Contains additional bolts for standard-deck LSX 6-bolt heads. Contains bolts for 2 heads (1 engine) NOTE: Engine set requires 2 - 17800568 bolt sets for conventional Gen III & Gen IV engines. For complete LSX set, order: 2 - 17800568 - Gen III & Gen IV bolt kits, 1 - 19257453 - LSX Standard Deck Bolt Kit. 19257452 Cylinder Head Bolt Kit – Tall Deck LSX Block (not shown) Contains additional bolts for tall-deck LSX 6-bolt heads; Contains bolts for 2 heads (1 engine) NOTE: Engine set requires 2 - 17800568 bolt sets for conventional Gen III & Gen IV engines. For complete LSX set, order: 2 - 17800568 - Gen III & Gen IV bolt kits, 1 - 19257452 - LSX Tall Deck Bolt Kit. 12499217 LS1 Cylinder Head Installation Kit (F-Car) Comprehensive cylinder head installation kit for 2002 Camaro and Firebird models equipped with the LS1 engine. Kit includes 2 head gaskets, 2 valve cover gaskets, 8 intake manifold gaskets, 2 exhaust manifold gaskets, 2 intake manifold-to-block seals, 20 long-head bolts and 10 short-head bolts 12589226 LS1/LS6 Head Gasket (not shown) Single gasket, 2 required; For naturally aspirated LS1 and LS6 5.7L engines; 0.051" thick. 3.920" max bore; Standard LS bolt pattern 12589227 LS2, L76 Head Gasket (not shown) Single gasket, 2 required; For naturally aspirated LS2 and L76 6.0L engines; 0.051" thick; 4.020" max bore; Standard LS bolt pattern 12610046 LS3, L92 Head Gasket (not shown) Single gasket, 2 required; For naturally aspirated LS3/L92 6.2L engines; 0.051" thick; 4.080" max bore; Standard LS bolt pattern 12582179 LS7 Head Gasket (not shown) Single gasket, 2 required; For naturally aspirated LS7 7.0L engines; 0.051" thick; 4.140" max bore; Standard LS bolt pattern 19331526 LT1, LT4, LT5 Head Bold Gasket Kit (not shown) Head bolts and head gaskets for Gen V engine 19418279 LT1, LT4, LT5 Head Bold Kit (not shown) Head bolts set for one Gen V engine 19419249 LS, LSX Head Gasket (single) Special head gasket for COPO supercharged engine - requires 2 BUILDER’s TIP Tiered performance cylinder head strategy delivers options Cylinder head selection is one of the most important contributors to an engine’s performance, because it ultimately determines how much air the engine can process to generate horsepower. The heads for regular-production LS- and LT-family engines are renowned for exceptional airflow attributes and offer significant power-building capability with traditional machining that enhances the volume of the intake ports and/or reduces restriction within the ports. Chevrolet Performance’s tiered strategy for LS cylinder head performance offers builders choices to fit a variety of performance goals and budgets. The first tier is our production-based heads, such as the LS3 head (P/N 12675871), which offer good out-of-box performance and are an excellent upgrade for earlier LS engines (as long as they have at least a 4.000" bore). The next tier is ported production heads, such as the LT1 CNC-ported head (P/N 19329839), which deliver significantly greater intake-port airflow at a value-driven cost. For production-based engines using forced induction—supercharging or turbocharging—the LS9 CNC-ported heads are the ultimate solution, delivering greater strength and heat management properties through a unique production process with the A356-T6 alloy. The top tier of Chevrolet Performance’s cylinder head ladder is the maximum-performance LSX heads, which are based on the design of production heads but include strength-enhancing features, such as thicker decks, to support high-horsepower performance combinations. They also have a six-bolts-per-cylinder design vs. the four-bolt design of production LS heads, for exceptional clamping strength with supercharging, turbocharging and nitrous oxide. The six-bolt heads must be used with Chevrolet Performance LSX Bowtie cylinder blocks. With Chevrolet Performance cylinder heads, there’s a choice for every horsepower aspiration and budget. 96 ChevroletPerformance.com Ls/LT/LsX-sERIEs COMPONENTs LSX 4.100" Bore MLS Head Gasket Kit LS1 Cylinder Head Installation Kit (F-Car) LS, LSX Head Gasket
