Seeking model by serial number old 150 v6

QBhoy

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Hi. Hope someone can help. After endless searching and much debate around the very noticeable difference between my old 150 and others…trying to find out more about it.
Very briefly, as far as I am aware, it’s had the decals changed from what it might have been originally. We think it’s maybe early 80’s in age. Has a red smaller looking flywheel…different carbs, air box (possibly reeds too) and I’m sure a different gear ratio to the usual. It’s definitely got much more mid range to top end power than any of the fair few other 150 2.0 engines I’ve had or known.
I’m thinking it’s either been messed with at some point or it’s not a normal 150 2.0.
Serial number on the freeze plug is
C858-8346
No search input I’ve tried recognises this number. Any ideas guys ? Appreciated
 

QBhoy

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Edit…that serial number was on the block. Not the core plug.
 

Dukedog

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Not a serial number.. pictures of tha powerhead both sides ad rear... wh number of carbs.. pic of trim style.. there is a build date stamped on tha port side, base of number 2 on block half.. pic below.. probably not a good as one in tha pic but in general same location of block...kinda behin tha timing arm...
 

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QBhoy

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Mar 10, 2016
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Not a serial number.. pictures of tha powerhead both sides ad rear... wh number of carbs.. pic of trim style.. there is a build date stamped on tha port side, base of number 2 on block half.. pic below.. probably not a good as one in tha pic but in general same location of block...kinda behin tha timing arm...
Ah. Got you. Really appreciate that. I’ll get another look at the weekend. Thanks again.
 

Fun Times

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Some info in the meantime looking around for the number you have.

Leads to a block number 8711A19 that has some “where use suggestions below of the following link, https://www.mercruiserparts.com/8711a19-cylinder-block

 

QBhoy

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Joined
Mar 10, 2016
Messages
8,342

Some info in the meantime looking around for the number you have.

Leads to a block number 8711A19 that has some “where use suggestions below of the following link, https://www.mercruiserparts.com/8711a19-cylinder-block

Brilliant info. Appreciate you taking the time !
 
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