Picked up sues boat today

[B&D Marine]

Thanks for the info. Have you compared them on the dyno?

I have not as it would be almost impossible to duplicate the exhaust, load, etc. as installed in the boat. Zoomers 5400 rpm's, Zoomers without "propellers" 5525, IMCO Gatlin's 5650, no mufflers 5800. 540 BBC 725 HP @ 6000.