I only have specs for the 4.5" bore engines but the 4-1/4" bore isn't going to be much different.
[attachment=63712]4 half bore end gap.jpg[/attachment]
Eddie, your info matches the D4600 Service Manual specs. Based on the .003 -.005 rule from your Apprentice Book, I'm out as much as .006 -.007 on the end gap on 3 rings. I think I need to find more oil control rings. I'm buying them from Florin and it's hit and miss. They are double-wrapped in wax paper and have cosmoline that's harder than concrete. I've broken three already trying to get them cleaned up.
Thank you Eddie and OM for the information.
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