Merchant Automotive - Grade C Head Gasket - Right (Passenger) - 2001-2016 LB7/LLY/LBZ/LMM/LML Duramax

This Grade C multi-layer steel (MLS) cylinder head gasket fits the right (passenger) side of 2001–2016 LB7, LLY, LBZ, LMM and LML 6.6L Duramax engines, plus 2010–2016 LGH Express/Savana vans. It replaces GM 12637788 (formerly 98045057). Grade C is the thickest of the factory head gasket grades, at 1.05 mm compressed. It's the common choice for rebuilds and for heads or blocks that have been resurfaced. It can be used safely with up to .008" of combined machining and with cylinder overbores up to .040". Outside those limits, piston-to-head clearance must be checked before assembly.

Key Features

• Replaces GM 12637788 (formerly 98045057)
• Grade C (1.05 mm) multi-layer steel head gasket
• Right (passenger) side; order the left side separately
• Safe for up to .008" of head/block machining
• Suitable for cylinder overbores up to .040"
• Fits LB7, LLY, LBZ, LMM and LML 6.6L Duramax

Benefits

• Restores a reliable combustion seal after a head gasket failure or rebuild
• Extra thickness gives clearance for resurfaced heads and decks
• MLS construction holds up to high cylinder pressures

Installation Note

If total machining exceeds .008" or the cylinders are bored more than .040" over, measure piston protrusion and piston-to-head clearance before final assembly. Always use new head bolts or quality head studs.

Fitment

• 2001–2016 Chevrolet Silverado 2500HD / 3500 / 3500HD 6.6L Duramax (LB7, LLY, LBZ, LMM, LML)
• 2001–2016 GMC Sierra 2500HD / 3500 / 3500HD 6.6L Duramax (LB7, LLY, LBZ, LMM, LML)
• 2010–2016 Chevrolet Express / GMC Savana 6.6L Duramax LGH