Nitrided is usually .030 thick, the original Tufftriding was less than .0010 deep How small are the mains and rods? I have several sets of the older Mopar race CL77(Clevite) main bearings in .002 and .003 sizes On the rod journals what size are they? Maybe it is time to resize the rodss to get them closer to the minumum inside diameter to reduce the rod bearings clearances How much clearances do you have on both now ? BTW, what size bore are you using to get 496 C.I. out of a 3.85 stroke Mopar crank?