mercruiser question

mercs4mark

Petty Officer 2nd Class
Joined
Dec 19, 2010
Messages
141
I was wondering what year mercruiser changed from the 8 spline vertical shaft on the mc-1 to the 13 spline shaft?
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,332
Re: mercruiser question

it was a long time ago, like early-mid70's

why??
 

mercs4mark

Petty Officer 2nd Class
Joined
Dec 19, 2010
Messages
141
Re: mercruiser question

I was just wondering I thought it was around 1973 just wanted to know for sure since the mc-1 has such a long manufacter run time with slight differences. serial number chart i have is so broad like 2791957-6225576 1970-1982 and was thinking if i knew what year they made that change would give me a better idea of the years units would fit.
 
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