I want to get others opinions on this. I'm up in the air as to go dry to tip or full dry with my exhaust. Engine is a blown 570, running a solid 258/262, 714/714 lift, 110 lobe separation. The guy that owned these engines prior to me, was running dry to tip with CMI sound elimination mufflers. I can see signs of reversion, but I think a lot of it was from the muffler design. I'm going to be running IMCO Gatlin mufflers, so there is minimal restriction, the manifolds will be 5" Stainless Marine Gen III. So the question is, wet or dry pipes?

I did a boat with dry to the inside of the transom. Then to the water dump thru hull. We picked it up there and put a fitting in the muffler itself. Worked great. No dis-coloring and cut the noise a bit

And you can Tee it there and run what ever amount through the muffler

I was thinking about making them wet, with a bung welded in, so I can dump whatever amount I want out the transom.

You just wanna stay in good terms for the yuppie tree huggers swooshing and sampling wine at their cocktail hour.
Lol... just playin. Looking forward to hearing yours. I'm going to be working on some prototypes this winter.

Your cams are close to whats in my NA 555's. I run cmi e-tops with dry to the tip tails. I know what you mean about the muffler design trapping water and adding to reversion risk. I was thinking about converting the tails to full dry but best I can tell its not really necessary as I cant see any signs of a reversion issue. I never let it idle below 1000 rpm for more than a few seconds either.

My 454's 252/264 on a 108* would revert a little at 600-700 RPM idle, TRS dry to the tip tails, Gaffrig mufflers and especially when I pulled my O2 bungs. Nothing that I was worried about though. And I have a long way to idle.

http://gaffrigperformance.com/boat-m...-pump-kit.html

I have a question for you. Im installing CMI split tops and dry tails to the tip on my 38 Fever. As we all know they sit low in the rear and was wondering is it a must to run flappers? I don't like the way the look but wasn't sure about the water backing un at the back of the boat when coming off plane to a idle.

Dry,neighbors love them ❤️

this is what I ended up using. Have had good luck with the internal flapper. All I can say though is make sure if you go with a different style you get the ones with the stainless flapper not the rubber flapper that most come with. Hope this helps.
https://www.summitracing.com/parts/edm-100-10?rrec=true