I ad two 454 Merc V drive bored to 496cu in. We alsostroked the engines. They are in a pleasure 39' 16,000# boat.<br /><br />Engines ran very well but we are using 1t oil every 5-6 hours per engine. Before the rework there was no oil usage to speak of. I have two concerd.<br />1. I believe to Piston (Alum) and Rings (Moly) were properly installed. However the engines were never put under a high load for any time EXCEPT when coming out of the holes.<br /><br />2. There has been a question raised about the stroked engines and the oil pan arrangement. There were no modifications made but with the V drive having a higher proformance engine do there need to be modifications to the oil pan to insure there is no oil thrown up into the cylinders?<br /><br />I would appreciate any insite someone might on how to solve the oil usage question.