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Yep, a bad riser will kill a 3.7. I got one in the garage that wasn't winterized and the riser busted dumping antifreeze into #4 cylinder. Took a little work but got it back running. If it ran hot Id check the oil, compression and antifreeze for tale tell signs. Sounds like your impeller may have gave up.
__________________
 77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude 
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