The rule of thumb on that is that there shouldn't be more than 10% difference between the cylinders. At 87 vs. 100 you are exceeding that. Is this motor on a boat or a stand? Reason being is that what a motor does in the driveway and what it does in the water under load can be two totally different things. My 150 Merc was only running on 3 cylinders but sounded like a dream on the muffs...in the water wouldn't do squat. Ferm thinks its priced high anyway...maybe you want to pass on that one.I'm sure some of the motor gurus will come along and chime in soon.
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 89' V20 project
Southeast Coastal Georgia
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