Arias 8.3, 573 Cubic Inch, short block assembly. No windows, water block, 4 1/2" bore, 4 1/2" stroke. Bryant Racing crankshaft Donovan gear drive. Was formerly a Blown Gas Hydro drag boat motor. Needs freshening. Comes with oil pump and V Drive oil pan. $4500. Have several closeup pictures for seriously interested buyers. Call 480 204-6579.