I have a P1 on my 89. I would guess by looking at my belt tensioner that it would work for both 8 and 10 rib setups. My tensioner just barely clears the stock fan blades. I know that the stock fan shroud neds to be notched for the 10 rib setup, but as long as the mark8 fan doesn't sit any closer than the stock fan does, I don't see why it wouldn't fit. Would it do anything different if the fan were installed upside down? I don't have one so I'm just guessing here.
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