Re: 6 Bladed fan
I noticed on my 52 Merc(omatic) there are a lot more blades than on the 53 which has a standard transmission. The 53 is a non runner so I can't comment on which cools better. The fact that the 53 had a trailer hitch on it would indicate it must have worked hard occasionally and still got by with only a few blades on the fan.
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