Unless you could have a fiberglass man do some creative rework above the step it would probably be messy and dangerous. Patriyachts idea seems like a simpler -lower cost option and might take care of the reversion. Your boat has an awesome setup and those rpms and torque numbers are fantastic for a carbuerated motors. I just wonder how long those bravos can take those kind of torque and rpm numbers?
Raylar

Bravo's were are very heavily modified with every trick possible.

I am not afraid to mod the fiberglass, I have already had to redo vast amounts of poor glasswork from the factory (I special ordered the boat new).

Patriyacht's suggestion was predicated on all that water being dumped into the tailpipes which it is not. They are dry to the end with 1/8th inch holes at the very end to moisten the flappers.

The reason I asked, I have a 509 with a big cam and jacketed exhaust down to the point they exit under the swim step, exhaust under water at idle. leak tested the engine and exhaust manifolds. still had scum under the valve covers. I installed flappers in exhaust with no change. During rebuild i installed 2 panavac crankcase vent system, one off each valve cover. Still had scum under valve cover even with 230-240 oil temps. We blocked off 1 panavac and connected hose into air cleaner from one valve cover. Left the other operational, my oil and valve covers cleaned up in 1, 1 hour run. (panavac uses exhaust gas velocity to create suction on crankcase)

Mark

I'm not familiar with the Ford cam situation, but those numbers on a big Chevy would suck the water bottles off the shelf of the nearest 7-11.

Motors are of course all air pumps. I have always run big Fords with huge cams but this is the first time I have had exhaust run under the platform.

These are 605 inch motors, Essentially the same as a tall deck chev with Pontiac Big Chief heads, with that in mind, is there a cam profile that won't suck the water off the 7-11 shelves?

With a dry-all-the-way-to-the-end header and your port separation angle, I'd say about 255 exhaust.

Call Laz at

www.mesabalancing.com

Trust me this guy will help you to the tee.

Fords...

There are beautiful air pumps and not so beautiful air pumps.

I chose the former, not the latter. :