Block, 18-20-25HP, Merc 2 Cyl.  Serial #5720345, early 80's, chrome bore, 1980-84?  No broke off bolts, fresh water unit.  Has rear block cover and exhaust covers.  Excellent STD bore, has some very, very fine scratches in one cylinder.  Very good builder block.  These blocks are hard to find these days this clean.  Missing intake port covers.  1 Available