4.200 MLX Head Gasket SBF Non-SVO Round Bore

The 4.200 MLX Head Gasket SBF Non-SVO Round Bore by Cometic Gaskets is purpose-built for small-block Ford engines running naturally aspirated or modestly boosted applications without the SVO cylinder head designation. This gasket addresses the critical sealing requirement between cylinder head and block—one of the most demanding interfaces in any engine assembly. Whether you're rebuilding a carbureted 302, refreshing a high-mileage 5.0L, or assembling a street performance engine, a quality head gasket is non-negotiable for reliability and longevity.

Cometic's MLX composition delivers superior gasket durability and thermal stability compared to conventional cork or composite alternatives, making it the preferred choice for both stock and modified small-block Ford applications. The round bore design ensures precise bore alignment and uniform clamping load distribution across all combustion chambers. At 0.76 lbs and engineered to OEM specifications, this gasket maintains factory sealing characteristics while accommodating the rigorous demands of engine rebuilds, machine work, and performance tuning. The 4.200-inch bore diameter is the standard specification for small-block Ford non-SVO heads, ensuring proper fitment with factory-style cylinder head fastening patterns.

Mechanics and engine builders trust Cometic MLX gaskets for both stock restoration and serious street performance work on 289, 302, 351W, and related small-block Ford variants. Installation requires standard torque sequencing procedures and a clean, properly resurfaced deck and head surface—critical steps that prevent gasket failure and internal coolant leaks. Proper head bolt torque specification (typically 65–75 ft-lbs in three-step sequence) ensures gasket compression and long-term sealing integrity. This gasket is essential for any SBF engine teardown, whether addressing blown seals, upgrading to aluminum heads, or assembling a freshly bored and stroked short block.