New 12 valve head quality

They make OK cores. Just plan on grinding the valve seats and milling them. I’ve been running one for several years at over 900hp with no failures. Mine has a fair amount of porting done to it, and I didn’t run into any serious casting issues while grinding. I actually have one on the truck and another as a spare.
 
I know you are asking about a Cummins head, and my experience is with the Chinese castings for the 6.0 Powerstroke. I have used dozens of sets (13 sets last year alone) with ZERO issues.
I echo what Drothgeb says, be prepared to grind valve seats and surface.
We NEVER buy complete, assembled heads (quality of work was sorry), and we’ve had great luck.
 
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