Del,
Why the 1150's? I expect that my combination likes the 1 13/16" venturis vs. the 1 11/16" on the 1050 and the 2" on the 80556 3-circuit 1150.

Mo Power,
Jets won't likely change the soot. No PV is for drag racing. A boat spends to much time at mid range for no PV. You are also wasting fuel.

That's what Advanced Product Design out of Ohio sold me as the right ones for the application -- man were they wrong!
I'm thinking about going with the 1050 marine version PN 80340-1, then I'm even coast guard approved. I can get them for 899.99 I just e-mailed Holley since I can find them at Summit and Jegs but not on Holleys site.
Or do you think the 1150 2 circuit would still be better?? For a couple of hp I'm not concerned -- I'd rather be trouble free boating!

Del,
I haven't used the 1050's so I can't comment. My understanding is that the difference on the USCG approved and the Holley regular carbs is just the J tubes vs. the straight tube that vents the fuel bowl. You can buy these for a couple of $ each as I did this on a set of 4150's a few years ago. They are just a press fit. If there is another difference I don't know what it is. Whatever you buy, you are going to have to find the PV what opens at the right time for your combination.

Spend the bucks and send them to Nickerson. He'll get them perfect, out of the box.
Good bye soot and hello performance.

I had the same problem with soot at idle. I run 91's at all fours and 5.5 pv's. But over the weekend the plugs are perfect around 3000 to 3200. I'm thinking of trying the crane ignition for the idle soot or drilling the holes like the previous suggested. I have 3-circuit 1050 and it runs great. Its in a 604 though.

Excal,
Before you start drilling, I suggest you drop your PV to a 4.5. If the soot decreases but does not go away, try the 3.5. The soot is most likely from the 3000 - 3500 RPM range, not idle. Try this, clean the boat and just idle. Soot? Then run 3000 RPM any check for soot. The lower PV will just delay when the carb adds more fuel. I have always been able to "tune" out the soot with PV changes.

By soot I mean the plugs. They look perfect at 3200,are sooty at idle.

Have you tried larger air bleeds on the idle circuit?