My 2011 6.7l did the classic valve break and destroyed the head and cylinder. I bought a brand new short block and have been buying everything new to have a totally new Long block. I'm working on buying new heads now and am wondering if I should get o-ringed w/ hd springs or stock. The original engine I updated turbo and cp4 to 2015+ and it is tuned and deleted with multiple other upgrades. I live in the mountains and tow an 18' enclosed work trailer that is loaded down. I tow it everyday and getting to some of these mountain homes to work on have steep long curvy inclines. Would it benefit me to spend the xtra few hundred per head for the o-ringed and hd springs.