1989 Johnson 175GT J175STLCEB. I recently replaced the head gasket on this motor and now I have a water leak coming out on the back side of one of the head bolt holes on starboard side. In tightened bolts to spec from the manual. Not sure why it would be leaking. I took head cover off and it is not warped. Could this be an issue with the block itself. Any suggestions or recommendations on what to check or how to fix this would be appreciated.