Gen IV LS9 Spec Multi-Layer Steel (MLS) Head Gasket & Valley Cover Master Seal Kit (Fits GM LS1 LS2 LS3 LS6 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L 6.2L)

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.

Free standard U.S. shipping
Eligible orders ship free to physical street addresses in the contiguous 48 states and Washington, DC. Orders normally process within 1 business day; transit is estimated at 3–5 business days, for 4–6 business days total after ordering. Business days exclude weekends and U.S. public holidays. Delivery estimates are not guaranteed. Alaska, Hawaii, U.S. territories, international destinations, P.O. Boxes and APO/FPO addresses are not supported.

Fulfillment and tracking
Eligible orders are fulfilled through Amazon Multi-Channel Fulfillment (MCF). BTSCAR remains the seller and handles customer service. Tracking is emailed after dispatch.

30-day returns and exchanges
Request an eligible return within 30 days of delivery. Standard returns must be new, unused, uninstalled and complete with original packaging. BTSCAR supplies a free prepaid return label, including for eligible change-of-mind returns, and charges no restocking fee. Contact support@btscar-us.com for authorization before returning anything; use only our label and instructions.

Refunds
After an eligible return is received and inspected, the refund is issued to the original payment method within 7 days. Bank posting times may be longer.

Full policies: https://btscar-us.com/policies/shipping-policy and https://btscar-us.com/policies/refund-policy

12-month limited warranty
Eligible products purchased directly from btscar-us.com are covered for 12 months from delivery against verified defects in materials or workmanship under normal automotive use.

Installed products
Installation does not automatically void warranty coverage. Installed items are not eligible for standard returns, but covered defects may qualify for warranty service. Incorrect installation, inadequate lubrication, contamination, overheating, misuse, racing, modifications and normal wear are excluded. Labor, diagnosis, towing and consequential expenses are excluded to the extent permitted by law. Statutory consumer rights remain unaffected.

Claim support
Email support@btscar-us.com with your order number, product or SKU, vehicle details and a description with photos or video. We may request reasonable installation or diagnostic information. Approved claims may receive replacement parts, an equivalent replacement, or a refund if no suitable replacement is available. We provide a prepaid label when an approved warranty item must be returned. Wait for our instructions before shipping.

Customer service
Phone / WhatsApp: +86 158 1943 1912. Daily, 10:00 AM–10:00 PM (GMT+8). We aim to respond within 24 hours; this is a target, not a guarantee.

Full warranty: https://btscar-us.com/pages/warranty-policy