my 42 with 427’s seems to be getting louder. I replaced impellers and belts last winter and I am wondering if maybe they stretched and might be slipping. There is water coming out the back and the temps never exceed 160F. I have no idea what the inside of the muffler looks like but it is a 100% fresh water boat and doesn’t even have surface rust one the outside of the cast rectangle. Is there a baffle inside that might be rotted out and gone? Is there a low margin of water volume between a functional water baffle and basically becoming a straight pipe exhaust? I want that low Chris craft  grumble back, not this brassy harsh sound!!

thx for any advice!

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When was the last time you did a valve job and checked the timing? I describe mine as sounding “throaty” when they need a little adjustment here or there.

Could also be your cast iron mufflers crapping out

This is my second season with her and I have neither done the timing nor the valves. She starts easily and runs well. I am not picking up any valve sounds.

Matt Cowles said:

When was the last time you did a valve job and checked the timing? I describe mine as sounding “throaty” when they need a little adjustment here or there.

That is on my list, put do the cast-iron mufflers crap out when they’re fresh water? I assume you can pull them and just look inside with a flashlight?

Jeremy Goldstein said:

Could also be your cast iron mufflers crapping out

I have good mufflers for you Call you have my #................got a 27 sitting by my shop door, letting a buddy across the canal from Malabu II, Larry and Lynell will be asking for assistance>>>>>>>

There’s nothing really in those mufflers, there’s a divider and a couple shallow water angles but it’s basically a strait through exhaust. I cut one open a few years ago and had new ones fabricated. 

thx for the call Byron! Good luck with your marathon project and hit me up when you have time!

While theres not a lot inside the old mufflers, I would imagine even if they had some of their gussets rotted away , they would be a little bit louder. 

And yes even in fresh water they eventually rust out. 

Mine were pretty much toast and they were alowing exhaust to collect in my bilge

glenn woudenberg said:

That is on my list, put do the cast-iron mufflers crap out when they’re fresh water? I assume you can pull them and just look inside with a flashlight?

Jeremy Goldstein said:

Could also be your cast iron mufflers crapping out

I also have lengths of 4'' copper pipe

Let me know make and model when you have a second so I can see what I need to fit them in.

Byron Smith said:

I also have lengths of 4'' copper pipe

I have wondered about this as well on my 1974 45'. It has DD's but the starboard side is louder. Water flow seems the same on both sides so i was wondering about these cast iron mufflers as well. Is there another option for these if they need to be replaced or do they have to be custom made?


In the super disc there is a reference to a guy that makes copies of the original rectangular ones in 3/16” stainless steel for $950 a pair but not sure how old that thread was

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