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Well I can’t say for sure as I didn’t keep track when I pulled the old plugs. I’m thinking of swapping the steam cleaned plugs with the normal looking plugs and see if the results follow. I’ve order more gaskets,,

No water in the oil. And Ive never got any water out of the cylinders. Just a little laying in the bottom of the manifolds. I’m wondering they don’t leak until they heat up

Unfortunately I didn’t keep track when I took the original ones out. I put new ac delco ones in. So am I looking at something deeper then exhaust?

Another picture of the worst looking ones

It’s efi but throttle body injection. So it has two fuel injectors not 8. On a couple of the original plugs I half wondered if I was seeing a little rust color on them. I’ll attach a picture. They were in hard and the ones that broke were from me taking them out.

Yeah they are surprisingly heavy. I got the exhaust from my buddy, but not sure they are usable. The mating surfaces are worse than mine. The only thing I’m confused about is the difference in the spark plugs with the condensation theory

My engine has the cold manifolds. Only one hose goes to the bottom of each manifold, and 160 thermostat. It is getting cool here now,, so I was idling the engine for the full 10-15 mins until I seen the thermostat open up then gave it only a couple small quick revs,,, maybe it is condensation...

Just checked compression, all were between 172 and 190 psi. I ordered an Amazon borescope this morning, And I’m buying a good set of exhaust manifolds and risers from a buddy today…

Ok thanks. I assume that could get water in both sides? What about head gaskets? But what are the odds both are bad,,,,

Boat was only fresh water used it’s whole life until I bought it 4 years ago. It never sits in the water and I flush it after every use

Not really, in my picture,,,,the middle two were each side front cylinders, working out each way to the rears on each side.

Figured I’d show what the brand new plugs looked like after the 15 minute run I have been meaning to get myself a cheap borescope

Yeah that would be the thing to do. I will definitely look into that

Not much at all,, but I figured it should be none. I’ll try to attach a picture,,,

Good points. I’m not sure what merc says in that regard but I’ve changed riser gaskets in my old boats before and never had an issue. Last one had dry joint which I liked a lot. I did put a straight edge along them and “looked” OK,,, but 0.003 is small lol. And I torqued to 33ftlbs and didn’t...

There was a little pitting on them. I cleaned the surfaces up good and I used a gasket maker with the gaskets as well. And showed no signs of water getting by when inspecting

Manifolds and risers are good. And I drained them both times before removing them.

Before winterizing this year I decided to pull the risers on my 5.7 efi open cooling, to check the gaskets, and found a little water in the bottom of both exhaust manifolds. I boat in salt water, flush it on the hose after every use, and the water in the exhaust manifolds was fresh water. The...

Installed a new pcv valve and it’s idling perfectly