Can you get your wrench over every bolt? Meaning do you have enough room in
the engine box to get your hand in there?
If so will you be able to get them out with breaking any of the bolts off?
If not you'll have to pull the motors Ug.
Other than that is it not hard. Use a thread conditioner (silver goop) on
the new bolts so they'll come off easier next time. Always new gaskets. The
thick metal ones.
Other considerations would be about anything in the boat. Salt gets
everywhere and ruins everything.
Given any choice I'd stay away from that boat. What else will it need? What
else does he know about it that he's not telling you and what leads him to
believe it needs manifolds and risers in the first place?

"Dano" wrote in message
ink.net...
Looking into a 1994 SeaRay 330EC with the 454's. Has had a life in salt
water and the owner says she needs new manifolds and risers. How tough is
this job to do myself (I would have the time over the winter lay-up).
What
other considerations are there for moving a salt boat to freshwater?
Thanks
for helping a newbie.
-Dano