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salrov63
The 1987 521 engine was one very strong powerful engine. In 1989 Ski-doo had to detune it. I would go with this engine. The CCW stands for Canadian Curtis Wright. They are a defunk engine builder that was around in the 70's. Some of the old John Deere snowmobiles had CCW engines. They were good for there time but are impossible to get parts for. The 521 block was used from 1983 - 1992
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Gargano's
Sea-doo, Ski-doo & Arctic Cat
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