This is the Corvair 3L test run. This engine powers the Panther Prototype N515XP and has SPA’s billet crankshaft, 2nd Generation 5th Bearing and Rear Alternator setup, along with all of William Wynne’s conversion parts. This engine, as of April 2014, has over 110 hours on it and is going strong. Not a single issue and sounds great – just like all Corvair engines on airplanes do. You can’t beat the sound and smoothness of a 6 cylinder!