Paul,

The bearing area on the shaft is 1.314".  The bolt pattern on the hub is 4".
I believe an SAE 2 hub has a bolt pattern of 4.75" and is standard on
Lycoming 320/360 engines.  Do you feel the housing thickness would be
adequate for the 200-250 hp range that would be available with the 13B?  As
I mentioned earlier, I would feel better using a larger diameter shaft.
(1.75-2.00")

Dave Kuc

Me too on the shaft but that would require a larger housing.
The housing looks plenty strong enough for that shaft but the flange at only four
inches in diameter will have problems with wood props.

Since you have to make a housing and flange anyway it seems like you 
should start from  scratch. Do you have a machine shop at your disposal?
Here is my suggestion for a PSRU. The external braces cut the weight
of the housing and stiffen it up. You can get a six pinion housing from 
John Moran as he is building them for Tracy Crook. Might be a good idea if you are
planing 250 HP. The flange shown can be enlarged to the 4.75 bolt circle.

Paul Lamar
 
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