On Jul 15, 3:03*pm, John H wrote:
On Thu, 15 Jul 2010 09:55:52 -0700 (PDT), Tim wrote:
On Jul 15, 11:28*am, Wayne.B wrote:
On Thu, 15 Jul 2010 07:00:17 -0700 (PDT), Tim
wrote:

Or
should I jsut bite it and buy a new manifold?

Yes, and check/replace the risers also. *If either one fails you can
hydro lock the engine with disasterous results. *In salt water they
have a typical life expectancy of 4 or 5 years.

Yes, and these are origionals from 1977. When I do the manifold work,
I'll at least take them to the boat shop and at least have them tested
and evaluated.

I put new manifolds and risers on the Proline engine when it was about 9 years
old. One of the manifolds had clogged from the loose rust scaling off the
inside. And, I took great pains to flush mine every time I took it out.

It's a pain in the butt, and they cost a little, but I'd replace them if they're
over thirty years old.
--

John H

Now would be a good time to start soaking it where the bolts enter the
head with wd40 or whatever similar product you like. If it seems like
a manifold bolt is going to break I'd cut the bolt head off first so I
could pull the manifold off and get at where the bolt enters the head
and still have some protruding bolt shaft to work with.