Too much air pressure on valve cover breathers

drugster said

Everything was new, my builder says he cut the first ring to. 024 and the second to. 028, flat top forged Icon pistons, Hellfire rings.

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A quick google look-up shows .004 to .005" per inch of bore for all the possible uses, street tot nitrous drag racing. Bore clearances for these pistons are pretty large so some extra blow by with pistons rocking and ring seal variations is not totally unexpected.
See here for ring gap and bore clearance:
[ame]https://www.uempistons.com/installation_instructions/icon_installation.pdf[/ame]

Read up on Hellfire rings; they are not standard cast iron. That makes me question what hone finish was used, break-in procedures, and which version of Hellfires was used. (There are references to reverse twist rings, which effect oil control.) Why did you or the builder choose these particular rings, and which Hellfire ring material is being used? Is this a race only engine? Nitrous? (Which is FME's key application for these rings.)
See here:
[ame]http://www.fme-cat.com/docs/1110.pdf[/ame]

The OP also need to tell us what break-in procedure has been used.