My guess is the boats a gasser. If memory serves ( last gasser I worked on was 5 years ago ) is the larger OD was the standard BUT who knows what has been done in the last 50 years.
How are you changing them? Will the boat be on the hard for some time?
Well the original diesel boats also had 1 3/8' dont remember the o.d I could have measure it 8 days ago but now I would have to get wet and water is to cold for that still
Mine has detroits 453t. Boat is hauled out for the next few months. I'll be replacing the thru hulls, replacing the bolts that hold the struts to the hull, painting the hull etc. I'll remove the struts from the boat and use a press.
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