Interesting I don't see any quench area. Are those stock Mopar heads or some custom castings? The 5.7 has them and doesn't put out near the power the new 392 is. I assumed every emission cutting mod would have been done no questions asked at Chrysler.
That is an interesting point about the removed quench areas in the cylinder head. The 6.4 has a similar compression ratio as the 5.7, no? Is it filled in more somewhere else or in the piston to maintain the compression ratio?