Originally Posted by 51timber
The boat was used in salt for the first 200 hrs. (7 years) last 2 years 95% fresh now about 300 hrs. Could I take both the risers and manifolds to a machine shop and have them clean them out and polish the mounting surfaces? Or should i just replace everything?
As mart-it said you could clean the manifolds and squeak a little more time out of them, but if it was my boat I would start fresh with new manifolds & risers. Think about changing out the thermostat too and don't be suprised if the thermostst housing crumbles in your hand when you remove it.