Upper Gear case Marking

[Lyndy]

I saw this marking on the Upper Gear Case when I removed the outdrive this weekend:

Upper Case
21 17

Any comments on this to help me Identify this outdrive?

 

[Reel Poor]

Re: Upper Gear case Marking

The 21/17 is the gear tooth count of the OMC Stringer drive. in your pic.

 

[Lyndy]

Re: Upper Gear case Marking

The 21/17 is the gear tooth count of the OMC Stringer drive. in your pic.

Thanks Reel. I am hoping to determine whether I have a 190 HP or 225 HP. Does this number narrow it to one or the other? It is off a 1974 SkipJack. At present there is a 96-98 Chevy 5.0 2BBL Rochester.

Is there something else on the Drive that might distinguish between the two Drives?

 

[Reel Poor]

Re: Upper Gear case Marking

Do you have the serial or model number off the engine?

That should be the 800 series, which is for the V-8's.

1974 - 190 hp - 21 / 19 Upper
1974 - 225 hp - 21 / 16 Upper

More Info Here

 

[Lyndy]

Re: Upper Gear case Marking

Reel, No I don't. Engine replaced within the last 5 years with a non OMC Engine. The drive I have is a High Profile and 5 bolt Exhaust Cover which is SUPPOSED to eliminate it being an 800.

 

[Reel Poor]

Re: Upper Gear case Marking

The 190 HP engine was a Ford 302 motor and the 225 was a GM 307 engine.

The 1974 drive is correctly named an, OMC Electric-shift "Stringer"

Even More Information

 

[Lyndy]

Re: Upper Gear case Marking

Thanks Reel. I think I have just about nailed it down now. You gave me a good piece to the puzzle.

 

[Lyndy]

Re: Upper Gear case Marking

Hey Reel! I just clicked on the link you supplied. It was my first document I found that resembled my drive. Since then I have noted the High Profile Stringer shown on page has a different shape Pivot Cap Cover then mine and it shows no Bumper on the Pivot Cap Assembly where I have one. That page was invaluable in my research.

Below was my first OMC Drive Reference:

My Pivot Cap: