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Old Jun 18, 2006 | 02:23 PM
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boehmdw97
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the b18a is about 10 hp less than the b18b and about 40 hp less than the b18c. the only difference between the a and b is the year model it came in. The head on the b18b is a lot better as far as air flow. That's where the 10 hp comes in.
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