ZONFANT Gen III LS Engine Gasket Set for Chevy & GMC — LS9 MLS Head Gaskets, Complete Overhaul Kit

ZONFANT's GEN 3 III LS engine gasket set is a complete, direct-fit collection of valley, head, pan, cover and seal gaskets — including MLS head gaskets for LS9 applications — designed to replace OEM part numbers for Chevy and GMC LS-series engines.

This comprehensive gasket kit bundles the most commonly replaced seals and gaskets needed when overhauling Gen III/LS engines. It includes valley and front cover gaskets, oil pan and rear cover gaskets, valve cover and water pump gaskets, damper and rear main seals, knock sensor grommets, an oil filter adapter gasket, plus two multilayer steel (MLS) head gaskets for LS9 engines. All pieces are engineered to match OEM form and fit so you can reduce expedition time and avoid sourcing multiple parts separately.

Which parts are included, and do they match OEM numbers?

The kit contains a full assortment of gaskets and seals that correspond to many original equipment part numbers. Every item is labeled with the OE references so you can cross-check compatibility before installation.

• Gen III valley cover gasket (OE 12558178)
• Two LS head gaskets (multiple OE references including 12617944 and MLS 12622033 for LS9)
• Oil pan, front cover, rear cover, valve cover, damper and rear main seals
• Water pump gaskets, oil filter adapter gasket, knock sensor grommets and four additional gaskets (OE list included)

Will this gasket set fit my Chevy or GMC LS engine?

This ZONFANT kit is designed for a range of GM trucks and SUV models that use Gen III/LS-block engines. Compatibility covers many 4.8L, 5.3L, 5.7L and 6.0L variants and specific model years noted by the manufacturer.

• Common Chevy fits: Silverado 1500/2500/3500 (various years), Suburban 2500, Express 3500
• Common GMC fits: Sierra 1500/2500/2500HD across listed years
• Works with LS1, LS6, LQ4, LQ9 and many LS2/LS3 applications and some iron-block 6.0L engines

How does the kit simplify engine rebuilds or repairs?

By supplying a broad selection of gaskets and seals in one package, this kit reduces downtime spent hunting individual parts. Components are manufactured to OEM-style specifications to streamline installation and minimize rework.

• Everything needed for valley-to-rear-cover sealing in a single box
• MLS head gaskets included for LS9 head-to-block sealing integrity
• Direct-fit components help maintain correct torque and sealing surfaces

What should I verify before ordering and installing?

Confirm engine variant and part-number matches for your specific vehicle, and note that intake manifold gaskets are not part of this set. Proper surface prep and following torque sequences are essential for a reliable seal.

• Cross-check OE numbers listed with your vehicle's service manual or VIN parts lookup
• Replace related hardware (bolts, studs) if service life is uncertain
• Ensure clean, flat sealing surfaces and correct torque specs during assembly

Who this is for: Experienced DIY mechanics, professional shops, and engine rebuilders working on GM Gen III/LS-series engines who want a single-source gasket kit matched to OE references. If you need intake manifold gaskets or specialty hardware, order those separately; otherwise this kit supplies most seals and gaskets required for routine engine removal, reassembly, or head service on supported Chevy and GMC models.