2006 Mercruiser 8.1

By 2006 generally cast iron. Use a magnet if you get a chance to look. The aluminum has a smoother paint finish where the cast has more of a orange peal look. The aluminum also used water rails below the manifold hence two parts. Cast is one part no water rail.

Good Luck.
 

Forum statistics

Threads
112,942
Messages
1,422,697
Members
60,926
Latest member
dander88
Back
Top