The valley ends of a Pontiac block seem to be exactly a 6" radius. See the attached picture of a pair of saddles that I made to mount my block in my Bridgeport for a different purpose.
I have a block that I was thinking about installing splayed caps on. I have a set of the Milodon splayed caps. They come with a drill bushing and say to use that and a hand drill. The Bridgeport seems like a better idea.
The thrust surfaces on the #4 cap seem to be the tough part. I have not found anyone local to me (San Diego) that can do them.
And you probably already know this, but with splayed caps, you cannot run a dipstick in the normal location.
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