Not sure if this has already been posted but I figured somebody might find it informative. Just did my first oil change on my deluxe 28 SHO with the 306 cc engine. After draining the oil I checked the threads on the pipe coming from the engine and can confirmed it is 1/4" pipe thread. I put a ball valve on the pipe it will make my next oil change easier. make sure to plug the open end of the valve in case the valve is opened by accident.
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