diamond piston question

[Jerry Clayton]

But he only has a,b&c grooves there isn't any fourth groove for an D ring

Only problem I have ever seen with Diamond stuff was there wrist pins which are from a outside supplier

[wrench87]

i spoke to the engine guy he said he uses a 5 axis cnc machine to cut the lands, he said he does this quite frequently on some of his high dollar off shore boat engines. he said he just goes in and does waht he has to he doesnt redesign the factory land. he feels when he sends them back to the manafacturer they dont take the time he does to make it right and more then one occasion they come back and the rings have to much play?. i was wrong i thought he said he was using total seal but he is using a custom ring from cna i have never heard of them.