I have an allegedly 1969 K&C Thermoglass 17.5 bowrider and OMC power (GM I4 120hp)<br /><br />On the block, there is the casting 1-17-71.<br /><br />Could this be the date it was cast? (therefore indicating it was repowered at some point)<br />I can't imagine they would cast an actual day in the block - maybe a year or month/year but month/day/year?<br /><br />Any ideas?