I'm running my 170 I/O without insulation and I think it could be quieter at cruising speed. When I saw Destroyer's post, I kicked myself again - I had a pile of lead we demo'd out of of an x-ray room in the early 90's and finally got rid of it just before I started fishing seriously. I could be casting a lot of weights and maybe quieting down my engine. The sheet wasn't all that thin and probably would have made the engine cover weigh a ton, so I'll have to forgive Destroyer for making me kick myself AGAIN - I do wish I had that lead though.
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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