In some cases, when you blow a head gasket, the head can warp causing it not to sit flush on the block. When this happens, machine work needs to be done to the head to ensure flatness. If your head has been machined .010 to correct a warp, a thicker head gasket is needed. This Cummins Replacement .010 Head Gasket is the perfect fit. This gasket is designed for heads that have been milled .010 and will ensure proper valve to piston clearance. This gasket is a direct fit and will create a leak free seal between your head and engine block.