Re: 39merc block
Just took a quick look when I got home at the block I have . The water holes between the center cyls have a almost triangle hole at the top ,round hole in the center and a trapezoid hole at the bottom. It has the core/freeze plugs in the pan rail and has a 3 3/16" bore . There is no 59 or other designation on the bell housing. I will clean the intake surface good and look for any numbers there. I have been wanting to build this engine and put it in my 40 .
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