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I have a Potvin cam in my 286 CI flathead. The cam is marked on the end .415. No one has any information on it so I am assuming it has just a tad less lift than the .425. It runs strong, has a nice lope and I am more than pleased with it's performance. It's in my 50 Ford with a T-5 Mustang trans and Maverick rear end and a 3:50 gear. Runs good around town and cruises all day long at express way speeds. Around 2,000 RPM at 70 MPH. My bore is 3-3/8 X 4 with the Merc crank and trip 97's.