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October 24, 2015 at 5:47 am
#25953
You have a Mercury Mark 30 with a Turbo Four powerhead. That is what they called the 30cu powerhead.
The hub for your prop is long NLA. There are props out there, watch eBay or put a wanted ad in free classifieds. The 11p is more common as it was used on Mark 25s and Mark 20s often. The 11.6p is harder to come by, expect to pay more for it. Even more desirable is the 12.5/13p bronze prop pretty much used exclusively for Mark 30. They sell for close to $200.
You could always have a lesser pitch prop cupped at prop shop which would bring RPM down.