When you’re chasing big boost and big horsepower, you can’t afford to overlook the hardware that holds it all together. The Atomic M12 Oversize Head Stud Washer Kit is engineered to address a common failure point in high-performance Barra builds — head crush around the washer seat.
These washers are precision-machined from hardened steel and feature an oversize 28mm outer diameter to better distribute clamping force and prevent deformation of the cylinder head under high loads.
✅ Key Features
✅ Oversize OD for Maximum Load Distribution
• 28mm OD spreads the clamping force across a wider area
• Reduces risk of cylinder head crush and uneven torque retention
✅ Hardened for High Torque Loads
• Manufactured from heat-treated hardened steel
• Won’t deform under extreme cylinder pressure or repeated torquing
✅ Engineered for Boosted Barra Builds
• Perfect for Ford 4.0L DOHC 6-cyl engines
• Designed to complement M12 head stud kits — including Atomic, ARP, and others
• Race-proven in engines making 1000+ horsepower
🔧 Why You Need This Kit
In high-boost applications, especially when using upgraded head studs and aftermarket head gaskets, the factory washer footprint is simply too small. This leads to the washer crushing into the soft aluminium head, causing you to lose torque and clamping force — which in turn leads to blown head gaskets or suspected stud stretch.
This washer kit is designed to solve that problem by spreading the load over a larger surface area. It’s a simple, affordable insurance policy against expensive engine failure.
📦 What’s Included
