I have the chance to purchase an O-320-E2A for my 9a project. I have purchased the Dynafocal mount and cowling for a fixed pitched configuration. The cross reference guide in the builders manual goes back to an E1A and then to A3B. The A3B indicates it's the same as an A3A except for a a straight riser in the oil sump. Is any of this an issue. I called Van's tech support and they weren't much help. Thanks for the help![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)