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#2
12-14-2011, 07:00 PM
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R/MR also often called pre alpha
can you expand on the question IE what are you trying to do? 
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#3
12-14-2011, 08:18 PM
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drives during those years are usually referred to by the horse power designation of the engine in front of it, in your case it would be a 165. Most of those drives are generally referred to as MC-1 drives, the MR(Mercruiser revised) drive was an early version of the Alpha 1, having the upper drive shaft bearing in the lower unit flipped over for better load control. The true Alpha one had a redesigned upper gear case to go with the internal changes of the lower. If you want to up grade an MC1 to an Alpha 1, you will need to keep the input shaft off of your drive
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#4
12-14-2011, 08:35 PM
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i was either gonna upgrade to a newer model or was just trying to get an idea to go through it and replace some parts boats has been sitting four years till i bought it
__________________
77 v20 cuddy cabin chevy straightsix 
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#5
12-14-2011, 08:59 PM
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the best deal going is the sterndrive engineering drives(SEI.COM), you can replace just the lower at first, or the upper
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#6
12-14-2011, 09:01 PM
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an alpha (gen 1) will bolt right up... you should have a 1.98:1 ratio... a 1.47/1.5 will also work but will require a prop with less pitch and may cost ya 1 or 2 mph
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#8
12-14-2011, 09:24 PM
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Quote:
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#9
12-14-2011, 09:51 PM
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thanks for the correct link smoke, BTW, the straight 6 used a 1.65 ratio
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#10
12-14-2011, 10:59 PM
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no prob.... My 76 merc 165 hp 250 ci had a 1.98 It came in an 18' sea sprite tri hull. I put it in a Carver 2667 santacruz flybridge sportfish.... I guess they came with 1.65 also tho?
was an awesome engine.... did over 40 in the sea sprite and 25-29 in the 5500 lb (empty) carver depending on how heavy she was loaded up to 6 people 100 gal fuel and 60 gal water
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