Im new to the jet boat life style so i dont know too much so forgive my ignorance if anything. I bought this boat about 3mo ago, and today i started my 455 Olds after a mild tune up i did about a month ago (plugs, valve covers, valve cover gaskets, new air cleaner, and wires) , reason why I waited a month is due to being in the military i can only come work on it every now and again in my home state. Anyway I started my engine up and it was at its normal smooth loud as hell idle and notice white steam coming out of the exhaust pipes and the ports right above the valve covers. The engine temp was normal, oil pressure was at 50 and my oil looked clean??? So i dont know if this engine is special but i have never seen an engine act that way in any of my cars or trucks. Can anyone please tell me if that's normal or what?????