Disclaimer - I have no, had no, won't have any financial interest in the company.
From their web-site the current price of a 'New' cast head is $290.
'New' cast won't have any thread damage or won't have any stress damage in the combustion chamber or water jacket that could potentially lead to failure during future ignition, regardless of rpm. They won't have worn, oversized lifter bores.
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.
40k+ miles, now jinxed?