Cometic MLS Head Gasket – BMW S50B30 / S52B32 (US Spec) | 87mm Bore | 0.045" | E36 M3 / Z3 M

Achieve maximum head sealing performance on your BMW E36 M3 or Z3 M build with the Cometic MLS (Multi-Layer Steel) Head Gasket for the US-specification S50B30 and S52B32 inline-6 engines. Important: this gasket is for US-specification S50B30 and S52B32 engines only — not compatible with Euro-specification S50 variants. Cometic MLS head gaskets provide superior sealing performance over OEM-style composite gaskets — requiring no sealants and delivering long-term reliability on aluminum-to-aluminum and aluminum-to-cast-iron head and block combinations. This 87mm bore, 0.045" nominal thickness gasket is suited for standard bore S50B30/S52B32 builds and mild overbore applications.

Key Features

• Multi-Layer Steel (MLS) Construction: Comprised of multiple embossed layers of stainless steel for increased strength, superior sealing performance, and the ability to rebound and resist corrosion — outperforms OEM-style composite head gaskets in high-output applications
• Viton-Coated Outer Layers: Outer stainless steel layers are embossed and coated on both sides with Viton — a fluoroelastomer rubber material heat resistant to 250°C / 482°F — designed to meet the demands of harsh sealing environments, varied load conditions, and a range of surface finishes
• Uncoated Stainless Shim Center Layer: Center shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements for compression ratio tuning
• No Sealant Required: Cometic MLS gaskets provide maximum sealing performance without the need for additional sealants — clean, straightforward installation
• Aluminum Compatible: Suitable for aluminum heads to aluminum blocks and aluminum heads to cast iron blocks — withstands the shearing force created by dissimilar material thermal expansion
• Cometic Quality: Manufactured by Cometic Gasket — a globally recognized leader in performance and OEM-replacement gasket solutions trusted by professional engine builders worldwide

Specifications

• Type: MLS Head Gasket
• Engine: BMW S50B30 (US) / S52B32 (US)
• Bore: 87mm
• Nominal Thickness: 0.045"
• Compressed Operating Thickness: 0.025"
• Material: Multi-Layer Stainless Steel / Viton-Coated Outer Layers
• Sealant Required: No
• Fitment: 1992–1999 BMW E36 M3 (S50B30/S52B32 US Spec) / 1998–1999 BMW Z3 M (S52B32 US Spec)
• Part Number: C4329-045

⚠️ US Spec Only: This gasket is designed for the US-specification S50B30 and S52B32 engines. It is not compatible with Euro-specification S50 variants (S50B30 Euro / S50B32 Euro). Verify your engine specification before ordering. Verify bore size, deck height, and target compression ratio before ordering. Surface finish of the head and block deck must meet Cometic's recommended specifications for MLS gaskets — a minimum 60 Ra surface finish is typically required. Professional engine building by an experienced machinist is recommended.