Atomic Head Stud Washer Kit – M12 Oversize OD (28mm) | Ford Barra DOHC | Hardened & Precision Ground
Description:
Big boost and high combustion pressure don’t just stress your head studs — they stress the cylinder head casting itself. In many Ford XR6 Falcon and other Barra-powered builds running standard M12 head studs or bolts, head gasket failures can be caused not by stud stretch, but by head crush — where the washer compresses the soft aluminum beneath it, losing clamping force over time.
The Atomic M12 Oversize OD Head Stud Washer Kit directly solves this. Designed with a full 28mm outside diameter, these washers spread the load across a much wider area of the cylinder head boss, reducing the risk of deformation, fretting, and head lift. Perfect for turbo street builds, mild track cars, or anyone pushing the limits of a factory casting with M12 fasteners.
Key Features:
✅ Suits M12 head studs or bolts – perfect for standard XR6 Falcon Barra engines
✅ Oversized 28mm OD covers the full top of the cylinder head boss
✅ Hardened and precision-ground for flatness and reliable torque retention
✅ Designed for Ford Barra 4.0L DOHC engines in mild to moderate power builds
✅ Helps prevent head gasket failures caused by head surface distortion
✅ Trusted in Atomic’s proven street and entry-level race engine builds
Why Oversize Washers Matter:
✔ Factory washers and ARP 12mm washers are too small for sustained boost loads
✔ Head crush causes false torque readings, blown gaskets, and sealing issues
✔ Our 28mm washers distribute clamping force more effectively across the casting
✔ Maintains torque settings over time — especially on re-torque after heat cycling
✔ Maximises the strength of your factory head without the cost of billet parts
If you’re pushing your M12-barra further than Ford ever intended, don’t skip this critical upgrade. The Atomic M12 Oversize OD Washer Kit is a small investment that protects your engine’s integrity and saves you from costly head gasket repairs down the line.
