4.320 MLS Head Gasket .098 BBC

The Cometic Gaskets 4.320 MLS Head Gasket .098 BBC is purpose-built for serious Big Block Ford engine builders and high-performance mechanics seeking reliable cylinder sealing under extreme combustion pressures. Whether you're assembling a stroker motor, refreshing a vintage race engine, or building a street performance platform, this multi-layer steel head gasket delivers the durability and conformability required for today's aggressive fuel blends and boost levels. MLS gaskets have become the industry standard for applications demanding superior blowby control and long-term reliability.

This gasket features a 4.320-inch bore diameter and 0.098-inch compression thickness—critical dimensions that directly influence combustion chamber volume, compression ratio, and head gasket clamping load distribution. The multi-layer steel construction uses elastomer-coated steel layers bonded to a stainless steel core, providing exceptional gas sealing capability, thermal cycling resistance, and conformability to imperfect deck surfaces. The 0.098-inch thickness is engineered to balance tight piston-to-valve clearance in modern BBC builds while maintaining adequate gasket crush and sealing integrity—a precise specification that matters when working with high-lift cams and tightly machined cylinder heads.

Mechanics and engine builders targeting Big Block Ford platforms—from carbureted hot rods to modern EFI conversions—rely on Cometic's engineering for consistent head gasket performance across thousands of heat cycles. Installation requires proper head bolt torque specifications, correct bolt sequence, and clean deck surfaces to maximize gasket life. This gasket is sold individually, allowing you to order exactly the quantity needed for your rebuild project. Pair with quality fasteners and verified machining procedures for optimal results.