All of the engine bearings are Clevite 77 parts--and more PolyDyn coatings can be found here, as well. This time, the material is PolyDyn DL--another dry film lubricant that oil sticks to. If there is a starvation problem, the coating is designed to keep the bearings from sticking to the journal. Oiling holes will be drilled to each specific main bearing after the trial assembly period. DMR likes to see .0030- to .0035-inch clearances on the main bearings and .0025-inch clearances on the rods.