[Jared Jordan]

Unless I'm mistaken, there is already a head CC rule for Stock Eliminator and I assume that the head was poured by an NHRA Official.

"Rulebook legal" may not mean what it once did, but at least there are objective standards to gauge the legality of a cylinder head as opposed to the subjectivity that reigned for 30+ years. The only cheating NHRA cannot eliminate the subjectivity from is acid-porting and it's my understanding that the 427 has a big enough intake port that it's not necessary to make them bigger to go fast a la the 360 Mopar.