Ford sabre 160Hp naturally aspirated marine diesels

Sabre diesel took over the marinization of British Ford industrial engines from Lehman in the late eighties I believe. Sabre's are Perkins Marine engines and Perkins Engine Company was purchased by Caterpillar in the early 2000's. Cat now has Perkins motors branded as their 4.4 diesel in a couple of formats being a prime mover for a generator that has sold quite a few units the last ten yrs and one that yacht engineers can set their watch for front and rear main seal failures at 2,000 hrs.. In the past I've had naturally asperated Sabre's from the 90's and they were adequate for emergency generator duties or use as a night or "harbor" gen but they weren't anything that I would want to stack high hours on. Parts are expensive and problematic to source for the base Perkins much less the Sabre marinized attachments.