The 5 crankcases (if all identical) are Continental O – 470 – 13A – used in a whole bunch of aeroplanes so might depend on where they were found.

O-470-13A

225 hp (168 kW) at 2600 rpm, dry weight 415 lb (188 kg), identical to the 0-470-13 but with an additional tachometer drive through the camshaft gear and one fifth and one sixth order crankshaft damper. Certified 19 January 1951