Old marine applications would use carburetors and often those carburetors weren't at all suited to changes in elevation. (Most of my knowledge is actually only

Old marine applications would use carburetors and often those carburetors weren't at all suited to changes in elevation. (Most of my knowledge is actually only of a specific family of Volvo / Penta pushrod engines) Probably airplanes, even in GA situations, are able to operate under negative Gs far more often that a typical marine application.... A person adapting such an engine would ideally think about oil pickup under such scenarios.