I think there is some confusion here about stainless risers, Mapism is thinking about the 4 into 1 type manifolds, but Mercruiser do make a stainless riser or elbow for their engines I know as I have just found out I have them on my Magnum 350, part No 816900A.
I must be incedibly lucky, I bought a classic Draco 24 that was traded in for a song and found the boat was in unbelievably good condition throughout, easily worth £10k more than I paid for it.
However I had the dreaded water leak through the steering pin in the shield, so I pulled the engine to do my modification ( boat number 16), I thought I'd go over the 1997 motor while it was in the shop, it has freshwater cooling from new so when I took off the riser I could see the manifolds were like new inside, but expected the riser to be rusted as this is where the seawater goes out , imagine my suprise to find they were shiny inside the water passages, thats when I checked the part number and found out they were SS. And there have been no issues with varying expansion rates (re Carlton).
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