help guys I took my heat exchanger apart to clean it out and there is a rubber bladder on the ends. Is this just to seal the ends. Or is it to separate the chambers.  I’m just about ready to fire these 427s up 

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Its a seal. These guys will have what you need for replacement http://www.sen-dure.net/

Matt can I just put a seal on the out side of the cap like felpro gasket and permatex.  Thanks 

CAN you? Maybe. I guess that makes sense. But to me, there’s a reason Sen Dure does a rubber piece that covers the entire backside of the end cap, and I’d be pretty nervous about what alternate fix would/wouldn’t hold, or what unintended consequence I’m not considering. Maybe others have actual experience with doing that.

I found my rubber caps on me cool I think. The PO owner of my boat made up his own and they leaked so he put some sort of red gasket goop on them to seal them. Not Ideal so I'd use legit gaskets. You need 4" gaskets and my kid game with an o ring for the end cap bolt too. Looks like Mr. Cool only carries them as a cap/gasket kit which you likely don't need but here are some cheap ones.  https://bpi.ebasicpower.com/shop/chris-craft-inboards/cooling-syste...

That’s a good point, Steve. As soon as I see something like that from a previous owner, my first thought is “what else did they cheap out on and try to improvise?”

Picture Mr. Fuel automotive electric fuel pumps from auto zone that were leaking fuel.. Among other things. =/ 

Matt Cowles said:

That’s a good point, Steve. As soon as I see something like that from a previous owner, my first thought is “what else did they cheap out on and try to improvise?”

Ha - yup! One of the first things we found was a crab cap with one of the wires being held in using a glob of silicone. Will have to see if I can find that pic again. No wonder the engine wouldn’t time correctly. But I’m sure it “sounded ok” to someone!

Correction - FOUND IT!  I'm sure this was a good idea to someone at the time.

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