Alliant Power Duramax Head Installation Kit Part# AP0046 fits 2004½-2010 6.6 L LLY, LBZ and LMM. This kit includes all of the necessary seals and gaskets to remove and install the cylinder heads as well as head studs to replace the factory head bolts. These applications utilize different thicknesses of head gaskets therefore the head gaskets themselves are not included in this kit and must be ordered separately. Please use the identification table below to choose the correct head gaskets for your Duramax.

Duramax Head Gasket Identification Guide
The 6.6 L Duramax engine families utilize three different grades (thicknesses) of head gaskets that are also specific to which side of the engine they are being installed on. The table and images below will aid in identifying the proper head gaskets required for your specific application. The head gaskets listed below work in conjunction with the AP0045 and AP0046 Head Installation Kits.

Note: These gaskets should be replaced “like for like.” It is not recommended to install gaskets of a different thickness than what was originally equipped.