I still don't get why Chrysler bothered to use closed-chamber heads on engines where the pistons are .050"+ down in the hole. Even the Magnums are .050" below deck, no quench to speak of in those. I bet if the pistons were at or close to zero-deck those engines could handle a full extra point of compression, heck the 5.9s had occasional pinging issues on low-grade gas and they were only 8.8:1.
I was complaining about that to friend of mine up the street who is a serious Ford guy and builds engines with his dad, he told me Fords don't really have that problem. They all came with essentially zero-deck pistons and compression ratio was determined by head chamber volume. It's not fair!! lol
