I ran across one and can not find any info on them anywhere.... Pj
Clark Model 501S Clark bought up the old Austin-Western Grader company and in 1977 produced a model they called the 501S. It weighed in at 32,000 lbs and was all wheel steer, and all wheel drive. Power was either a tripple nickle Cummins (Vt-555) or a Detroit 6V-71N. either produced around 185 flywheel HP. Blades of 13' and 14' widths were available. They were apparently not big sellers
Very similar to an A-W super 366 like Dwan Hall and I run. If you don't want that 501 please UPS it to me.