Interchange/OE Part Numbers: 12622033 (LS9 Head Gasket), 12558178, BTR73450, 12617944, 12612350, 12630223, 12633904, 12637683, 12585673, 12639249, 89060436, 12551933, 12611384, 12558177.
Shipping & Package Specifications:
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Item Weight: 4.24 pounds
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Package Dimensions: 24.0 x 14.0 x 2.5 inches (Flat-packed to protect MLS integrity)
What's Included in the Package List:
- 2x LS9 Spec 7-Layer MLS Cylinder Head Gaskets (12622033)
- 1x Gen IV Valley Cover Gasket (12558178)
- 2x LS1/LS2/LS3 Exhaust Header Gaskets
- 1x LS Engine Oil Pan Gasket
- 2x LS Water Pump Gaskets
- 1x LS Front Engine Cover Gasket
- 1x LS Rear Engine Cover Gasket
- 2x LS Valve Cover Gaskets
- 1x Rear Main Seal
- 1x Front Crankshaft/Damper Seal
- Complete assortment of Water Crossover Gaskets, Block Off Gaskets, Oil Filter Bypass Gasket, and Knock Sensor Grommets
Engine Block Compatibility (For GM LS-Series V8 Engines):
(Fitment Note: This is an engine-specific performance upgrade kit. It fits a wide range of Gen III and Gen IV LS-based engines. Please confirm your specific block and bore size compatibility before installing on highly modified engines.)
Compatible GM V8 Engine Architectures:
4.8L / 5.3L / 5.7L Blocks: Fits LS1, LS6
6.0L / 6.2L Blocks: Fits LS2, LS3, LS9, LSA
Iron Block Applications: Fits LQ4, LQ9 (4.8L / 5.3L / 6.0L)
Ultimate Boost & Horsepower Sealing: Heavy-Duty LS9-Spec Master Engine Gasket Kit for GM Gen III / IV LS V8
Are you dropping massive boost from a turbocharger or supercharger into your LS build, or pushing extreme cylinder pressures on a high-horsepower naturally aspirated setup? When you are building a high-performance engine, ordinary head gaskets are the weakest link, frequently leading to catastrophic blowouts and lost compression. Bulletproof your powerplant from the inside out with this Ultimate High-Performance Master Gasket Kit. Featuring the legendary genuine LS9-spec 7-layer Multi-Layer Steel (MLS) head gaskets—originally engineered by GM to handle the fierce factory-supercharged Corvette ZR1—this package is the absolute gold standard for extreme horsepower stability and unmatched blowout resistance.
Sourcing high-end performance head gaskets while trying to hunt down matching individual valley cover, oil pan, and cover seals from different places is a major hassle that opens the door to leaks. This premium master overhaul package maximizes your engine teardown value by providing a complete top-to-bottom reseal solution for Gen III and Gen IV LS blocks. Meticulously flat-packed to protect the delicate, rigid structure of the 7-layer steel matrix during transit, this kit ensures an absolute, heavy-duty seal capable of handling whatever numbers you throw down on the dyno.
Key Features & Included Components:
Legendary LS9 7-Layer MLS Gaskets: Includes 2x authentic LS9-spec 7-layer Multi-Layer Steel head gaskets (12622033) for ultimate sealing under high boost and intense combustion loads.
Complete Bottom & Top End Sealing: Comes with a Gen IV valley cover gasket, 2x valve cover gaskets, a high-grade LS engine oil pan gasket, and heavy-duty LS1/LS2/LS3 exhaust header gaskets to completely seal the block.
Essential Front & Rear Hardware: Features dedicated front and rear engine cover gaskets, 2x water pump gaskets, a brand-new rear main seal, and a front crankshaft/damper seal to guarantee a completely leak-free engine bay.
Comprehensive Assortment Package: Includes all the critical minor seals that are easily forgotten, including water crossover gaskets, block off gaskets, an oil filter bypass gasket, and heavy-duty knock sensor grommets.
(⚠️ CRITICAL FITMENT & CONFIGURATION NOTE: This is a highly specialized engine performance upgrade kit. It is universally compatible with most Gen III and Gen IV LS-based iron and aluminum blocks across 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L architectures, directly fitting LS1, LS6, LS2, LS3, LS9, and LSA engines, as well as LQ4 and LQ9 iron block applications. Please carefully verify your specific block bore size, cylinder deck modifications, and custom build specs before purchasing to ensure proper fitment.)
Engineered to meet or exceed strict high-performance specifications to ensure long-lasting, worry-free structural durability. Rebuild your block the right way with BTSCAR's premium sealing components, handle the pressure, and hit the track with absolute confidence.
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30-Day Returns: We gladly accept returns and exchanges within 30 days of receiving your order. (Please kindly keep the product brand new and the package not damaged)
Standard Return Shipping: For standard returns and exchanges (e.g., ordered the wrong part, changed your mind), the buyer is responsible for the return shipping costs.
Note: As per our store guarantee, if you experience any quality issues with our engine kits, we will cover 100% of the return shipping costs.
1-Year Warranty: We stand behind our products with a full 365-day warranty.
Free Shipping on Returns: Zero risk on engine kits. If you encounter any quality issues, we will cover the shipping costs for returns or exchanges.
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