mid 80's merc 20 prop pitch & how to remove stuck prop

sczeck

Recruit
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Jul 22, 2013
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I am trying to figure out what prop my mid 80's Merc 20 has. On the side it says 9p a4. I have tried cross referencing this on the internet but cannot find any info.

Can I assume this is a 9 pitch? or 9 inch? or ?

I need to buy a spare prop, so short of dragging my boat down to the local marine store, I am looking for info.

On a side note, I have tried removing the prop and have had no luck. I removed the nut and washer, but the prop does not pull off, am I missing something or is it likely this thing is corroded on? Someone suggested there might be a in or something???

from what I cab tell its an early 80's - 8 spline which I understand they stopped doing in 86?
 
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