Any experience with the original mufflers on a 1970 38 Commander? Presume they are cast iron? Any issues I should know about? How long can I expect them to last ... already 50 years old? 

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They are cast iron, fresh water they last a very long time, how long? I think that greatly depends on conditions. I had to replace them on my Commander because they were cracked, presumably from improper winterization. Like anything else on a 50 year old boat, you have to inspect them for condition. 

As long as they're not leaking water into the bilge, and you're okay with the sound out the back, don't worry about them. If you want total peace of mind, go get a set of Centek mufflers and be done with it.

Like everything on these boats. They are overdone. I had a spare pair and they are thick, very thick. Unless you trap water in them for winter. They will last and last.

BTW.... Mine are 52 and still going strong. :)

I would be more concerned with the hoses than the mufflers.

Definitely this. I think this is something often ignored. All of the hoses on my boat were very old when I got it, many were original. The scariest were the fuel lines that actually crumbled in my hands when I removed them. 

Brian Barton said:

I would be more concerned with the hoses than the mufflers.

Heres what you can expect your 50 year old muffler to look like

It would be a good idea to replace the hoses and while the hoses are off to really inspect the mufflers .

Mine appeared to be functioning but after began tapping on the bottoms of them I was easily able to push a screwdriver thru them .

Yes they were heavy cast iron but eventually they do rust thru.

I have one that came of my commander in decent shape should you need one.



I had intended to just put new hoses on mine, same time as new risers and elbows. But the inlet of the mufflers were so corroded that new hoses wouldn't fit over them. Very much like Jeremy's photos. The old hoses were like they were welded onto the mufflers, both inlet and outlet. So I ended up replacing the whole thing from manifolds to transom.

Thanks for the comment, Jim. Did you note any significance difference in the noise? And did you use wire reinforced hoses? How far is the hose run?

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