650-700HP looking for info on what Stainless Marine Gen1 is good for, seems mine may be part of my issues for HP.... I cannot find specs on HP limits.... anyone know where to find them??

I am TRS dry to transom, mixes at very end of tails...talked about converting to dry, but if the manifolds hold me back there's no point..

Tim what size v-band flange is on the top of those manifolds? Where the risers clamps on...

I will have to measure 3.5-4" maybe? Isn't there only them and the oval?

Correct. Oval is on geniii manifolds. Working on something thought you might know size. I think it's 4-1/2" not 100% sure.

I can measure later

Just measured mine. OD of flange 4.5" ID of riser 3.5"

3.5" for the ID of flange too i assume?

Speaking of exhaust, and I have mentioned this too, many times over the years, take 20 minutes and make sure that the exhaust manifold ports don't protrude (block) any of the cyl heads exhaust ports.

Good how to do this with a manilla folder is here: http://www.stahlheaders.com/ports.htm

BTW: this is the good way to make gaskets, if anyone needs to do this. Obviously use sheet of gasket material instead of folder. LOL.

I know there are vids of making gaskets on line doing it this way, look it up if your not sure how hard to hit with the ball peen hammer. It is basically light quick hits around the openings....bolt holes and port openings.

BTW#2: If one hasn't checked intake port line ups, this is a good method too. I had a Professional Products intake long time ago that was way off on a few ports. Must have had bad core shift. And yes, I have run into it on exhaust ports vs header flange a few times too.

Found a vid, go to 2:00 here:
https://www.youtube.com/watch?v=ijlPwA7W29M

Correct 3.5" inside flange.. Keep in mind the inner tube is 3" inside the 4" outer tube. Hope this helps.

I have some extra Gen III clamps, fittings hoses and risers for sale