I finally have my boat running like a top after flushing engine, cleaning fuel system, and replacing ignition among other things. It sounds great, but I know through running it with the old gas before and just checking the plugs during the whole tune up process, I got quite a bit of carbon built up in there. Plugs are dry now that the engine is running well and turning the color they should be.<br /><br />My question is, when I take it out on the lake for the first time to try it out and finish tuning and setting timing, should I take a can of seafoam and slowly dribble it straight into the carb during a slow run to clean some of that carbon out or simply mix it with the gas?<br /><br />I have heard on older engines, this is a 1978 GM 350 V8, it is sometimes not recommended to aggressively go after carbon build up as it can sometimes seal gaps and spaces over time and actually be beneficial. Is this way off?
