Hi, thanks for the kind reply. The serial # is OT2731XX and the model # is
120041240. It is definitely 200HP and the person that we bought it from
(executor of an estate) indicated year 2000 but we could stand subject to
correction on that.
We have O rings surrounding the cylinders and they have been renewed and are
not an issue. The perimeter of the head has a shallow groove that gets a
spaghetti thin, rubber type, gasket, (part # 858452) complete with areas
that surround each head bolt. We are not totally incompetent but have had
great difficulty getting this gasket to stay in the grooves/recesses long
enough to place head on the block. We are on the verge of trying a high
tack, adhesive spray on one side of the gasket in question and then trying
to get it to stay put. Is it only us or what are we missing (beside
intelligence)?. Thanks, Bob