Spartan MLS Head Gasket SBM 4.126 Bore x .039

The Spartan MLS Head Gasket SBM 4.126 Bore x .039 from SCE Gaskets is engineered for serious small-block engine builders and high-performance mechanics who demand reliability under extreme cylinder pressures. This multi-layer steel (MLS) head gasket serves as the critical seal between cylinder head and engine block, preventing combustion blow-by and coolant leaks that can derail your build. Whether you're assembling a street engine, competition platform, or rebuilding a stock block with enhanced compression, this gasket is designed to maintain integrity across thermal cycles and sustained boost or naturally aspirated operation.

MLS gasket technology uses multiple layers of spring steel coated with elastomer materials to create a conformable yet durable seal that flexes with cylinder head movement while resisting compression set. The 4.126-inch bore diameter and .039-inch thickness are precision-engineered to match small-block dimensional standards, ensuring proper clamp load distribution across the gasket face. SCE's Spartan series combines proven MLS construction with OEM-level manufacturing tolerances, making it suitable for both stock-replacement applications and modified engines running elevated boost or compression ratios. The lightweight design (1.11 lbs) minimizes additional engine assembly weight while the engineered material composition resists corrosion and maintains sealing integrity across repeated thermal stress cycles.

Mechanics and engine builders rely on this gasket for small-block applications where head gasket failure can compromise months of machine work and tuning investment. Proper installation requires clean, flat cylinder head and block surfaces with torque specs applied in three-step sequences to manufacturer specifications—critical for achieving the clamp load needed to activate the MLS sealing layers. This gasket suits naturally aspirated performance engines, turbocharged small-block platforms, and street/strip applications where consistent sealing performance is non-negotiable. Always verify your specific engine block and head casting numbers match SCE's compatibility data before purchase to ensure bore diameter and thickness alignment.