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I have the Westerbeke 4-108 and it's been a very good engine considering it's 33 years old now, but it only has 2800 hours on it. It leaks a little oil, but the drip pan catches that and oil is cheaper than tearing down the engine and replacing seals.....
From my understanding Perkins built the blocks, and Westerbeke puts on their external components like heat-exchangers, fuel injectors and such. A lot of these componets are built by common suppliers anyway, so either engine will have similar performance and longevity. Westerbeke parts may be more expensive though. The other differences may be the horsepower, some have larger bores than others. I believe the range was between 37 and 50 HP ( I could be remembering these wrong)
Last edited by ehmanta; 06-04-2009 at 02:06 PM.