4.155 MLS Head Gasket .051 - SBF SVO

The Cometic Gaskets 4.155 MLS Head Gasket .051 - SBF SVO is a precision cylinder head gasket engineered for small block Ford engines demanding reliable combustion chamber sealing under elevated boost and compression loads. This gasket is essential for builders and enthusiasts performing head gasket replacement, engine rebuilds, or modifications on SVO-equipped Ford platforms where original equipment specifications have been exceeded. Proper head gasket selection is critical—choosing the wrong compression thickness or material can result in blown gaskets, coolant loss, and catastrophic engine damage.

This gasket features multi-layer steel (MLS) construction, the industry standard for modern high-performance applications, which provides superior conformability and reusability compared to older composite designs. The 4.155-inch bore diameter is precisely matched to SBF small block Ford cylinder heads, while the 0.051-inch compression thickness is critical for maintaining correct piston-to-valve clearance and static compression ratio—specs that directly affect ignition timing, detonation margin, and overall engine stability. MLS gaskets use internal steel springs and elastomer layers to maintain sealing force across thermal cycles, making them ideal for turbocharged, supercharged, or high-revving naturally aspirated builds where temperature and pressure fluctuations are extreme.

Mechanics and engine builders working on small block Ford SVO conversions, turbo swaps, or stock engine refreshes will benefit from Cometic's precision engineering and quality control. Installation requires proper head bolt torque sequencing, clean block and head surfaces, and careful measurement to confirm bore alignment before assembly. This gasket is sold as a single unit and is compatible with standard small block Ford head bolt patterns; always consult your engine's service manual for correct torque specs and any gasket-specific installation requirements to ensure optimal sealing and longevity.