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Is a 1985 HO 305 from truck roller motor?

No, a 1985 HO 305 was not a roller motor. The "roller" designation in small-block Chevys refers to the use of roller lifters and camshaft. While some 1985 305s had roller camshafts, the high-output (HO) version of that year typically used a hydraulic flat-tappet camshaft, not a roller cam. Therefore, it would not be considered a "roller motor" in the common usage of that term.