I am almost positive that the Chris Craft 181 is based upon the GM Mercruiser 140hp 181, but I have not seen one in person. I am curious about the exhaust configuration. The ports of the manifold almost match the mercruiser high output head. The mounting bolts do not, however, which is another good reason to use a spacer/adaptor to make this manifold work. I know of another one available if anyone is interested.
