I can see the benefits of the outer edge of cap register for locating the cap. Several different production blocks have come that way. My concern would be the cap wanting to pull inward under high leads like a rod cap does. Maybe this is not an issue as the main caps are so much larger (stronger), made from
better steel, and the crank wanting to "orbit" around the whole
main cap under high rpm conditions vs the rod cap seeing high inertial (tension) loads at the same rpm.
On the race blocks Jimmy Keen ran (Production Race blocks from Ford) we machined registers in the block webbing for each main and had custom caps made with "tangs" vs dowel pins/ outside
registry like is being reported. NO fretting, no block issues after that on the Keen stuff.
Hope it works well. Some one is thinking.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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