18'' donzi, 500 hp possilbe to run 75??
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A friend had a 500 TRS 22c that ran low 80s gps so the 18 should be good to go I ran an 18 454 400hp volvo at 75 on the nordscog so it was probably 73 really nothing fancy but the hill prop, external steering and hydro nosecone.
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-----The year...1979. I lucked into a brand new leftover X18 powered with the 330/454 TRS package. The boat would do 70 absolutely stock down to the prop. I found out talking to John Chisholm (DONZIs owner at the time) that they only built a few big-block 18s as they felt there might be a liability issue. Drive was very deep and the boat would heal way over in a sharp turn at slow speeds. Enough that the boat would take on water into the cockpit. Wife wasnt exactly thrilled by the boat so I traded even up for a brand new 1980 Corvette.......Bill S