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That's nothing unusual for the new hemi's with any power adder. The top ring is so close to the dome they break easily.
My buddy did the same thing with 3psi of boost.







Been there, done that. He did nothing wrong. The ring land is 3mm from the top of the piston to prevent hydrocarbons from being trapped in there. GS Motorsports warns that anything over 6 psi must have replacement (forged) pistons installed.