Description 2001 – 2004 LB7 6.6L GM Duramax Upper Engine Gasket Set Enginetech # GM403HS-C Head Gasket & Bolts Not Included Enginetech helps you build better engines, faster. Rather than duplicating OE designs, The Rebuilder’s Gasket is designed specifically for the rebuilder. They accommodate the kinds of surfaces you have to work with, and they really do the job, without leaks. Enginetech engineers analyzed the special sealing problems of each engine covered, and designed the gaskets and seals that would work best in each part of the engine. Thermal shock dyno testing verified the design excellence. Unlike OE designs, The Rebuilder’s Gasket is designed for and works better on rebuilt engines. Individual gaskets are die cut from the right material in the right thickness for each application, and have elastomeric sealing beads in critical areas. Head gaskets are no-retorque with virtually no loss in clamping force over time, perforated to eliminate material separation and leakage, and are coated with a premium silicone blend to allow head-to-block movement and easy removal. Precise thickness gives predictable sealing, fire rings are oversize (for oversize bores), and elastomeric sealing beads meet special sealing needs.
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