[Tom Vaught]

Originally Posted by gavin

What I was really interested in was the hole center placement and that is whats important. Both you and tom come to a similar figure so if I change it to 7.352 it will be close.

Good Job, Gavin, on the extra effort to get the starter in the right location (Hole Center Placement) on the parts as well as help create some info for the other Pontiac Block configurations.

Tom V.

If you assume that the Ansen people knew their jobs, the 55-60 bellhousing offered in the "For Sale" section shows the starter bolt holes to be in line with the centerline of the starter shaft and at approximately at 63 degrees, from horizontal, not at 69 degrees (40 + 29) as in the Wilhite drawing.

[BruceWilkie]

Originally Posted by Tom Vaught

Good Job, Gavin, on the extra effort to get the starter in the right location (Hole Center Placement) on the parts as well as help create some info for the other Pontiac Block configurations.

Tom V.

If you assume that the Ansen people knew their jobs, the 55-60 bellhousing offered in the "For Sale" section shows the starter bolt holes to be in line with the centerline of the starter shaft and at approximately at 63 degrees, from horizontal, not at 69 degrees (40 + 29) as in the Wilhite drawing.

fwiw
I checked a 56 hydramatic starter pattern angle... Its straight across and at 60 degrees to dowels. Upper starter bolt is 7/16" and lower is 3/8". Upper bolt goes thru a boss from back of bell. Early bell has starter further outboard than a 61 up due to larger diameter ring gear. The starter center was also @ 1/2" higher relative to pan rail.

The housing made a nice template for starting housing bolt holes on my adapter. I started my dowel holes(1st) with a pin drill in my dremel at scribed marks, then on drill press gradually increased hole size. Put dowels in plate and housing over dowels to locate the rest of the block holes.

I've got more pics of my adapter plus some starter info I'll add to the thread later.