5150 AutoSport
5150 AutoSport Head Gasket & Head Stud Kit, BMW M20
5150 AutoSport Head Gasket & Head Stud Kit, BMW M20
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Performance Head Gaskets & ARP Head Stud Kit for BMW M20 Engines
Upgrade your BMW M20 engine with high-performance head gaskets and ARP head studs designed for maximum reliability under extreme conditions.
Cometic MLS Head Gasket
The Cometic MLS (Multi-Layer Steel) Head Gasket is a premium replacement for BMW part numbers 11121722734, 11121722735, 11121722737, and 11121722738, fitting M20B20, M20B23, M20B25, and M20B27 engines in BMW E12, E21, E28, E30, and E34 models. MLS gaskets provide superior sealing for high-compression, turbocharged, and supercharged applications by resisting shearing forces and minimizing bore distortion. Made from multiple layers of stainless steel, they are corrosion-resistant and ideal for engines subjected to high temperatures and pressures.
Specifications:
- M20B20 / M20B23: 80mm bore, 0.070" thickness
- M20B25 / M20B27: 84mm bore, 0.070" thickness
This gasket is not compatible with engines using O-rings or receiver grooves, as it requires a smooth, flat surface to seal properly.
Athena Cut Ring Head Gasket
For high-boost applications exceeding 16 psi, the Athena Cut Ring Head Gasket is the preferred choice. It features AISI 304 stainless steel Cooper Rings that bite into the aluminum head for maximum sealing, preventing leaks that can lead to power loss or engine failure. Made from OE-approved reinforced M0115 material, this gasket is designed to withstand extreme cylinder pressures in turbocharged and nitrous applications exceeding 2 bar boost.
Key Benefits:
- Handles extreme pressure better than OEM or MLS gaskets
- Prevents compression leaks and overheating
- Should be 0.5mm to 1mm larger than piston size for proper fit
Installation Notes:
- Ensure cylinder head and block surfaces are clean, flat, and properly resurfaced
- Do not use additional sealants
- Follow proper torque specifications and sequence for even clamping force
ARP Head Stud Kit (201-4305)
For maximum durability, pair your head gasket with ARP 201-4305 Head Studs, engineered for BMW M20B20, M20B23, M20B25, and M20B27 engines. These high-strength studs provide increased clamping force, preventing head gasket failures in high-boost and performance builds.
Why Choose ARP Studs?
- Stronger than OEM bolts for improved head gasket sealing
- Essential for high-boost and turbocharged applications
- Reduces the risk of head lift under extreme pressure
Before installation, always check and resurface the cylinder head and block to ensure they are completely flat for a proper seal.
12 | 10 | 4 | 2 | 6 | 8 | 14 |
13 | 7 | 5 | 1 | 3 | 9 | 11 |
BMW M20B20 Applications:
BMW 3 Series
1977-1982 E21 320 / 326
1982-1994 E30 320i
BMW 5 Series
1977-1981 E12 520 / 526
1981-1987 E28 520i
BMW 7 Series
1981-1987 E23 720i
BMW M20B23 Applications:
BMW 3 Series
1977-1982 E21 323i
1982-1994 E30 323i
BMW M20B25 Applications:
BMW 3 Series
1985-1993 E30 325i / 325is / 325ix
BMW 5 Series
1987-1990 E34 525i
BMW M20B27 Applications:
BMW 3 Series
1982-1987 E30 325e / 325es [North America]
BMW 5 Series
1982-1987 E28 525e / 528e
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