Mercruiser 7.4 MPI Gen VI (1998-2000 I think)
www.boats. net/parts/search/MercuryMarine/0L609594/2705/parts.html <- link to my engine.
I have replaced the exhaust manifold, risers, themostat, t-stat housing, impeller.
Engine will stay at 160 on the hose. When I took it out, it would...