I need schooling - old vs. new engines

DionR Ya they do, I was told back in 2013 after I put a 6.4 cam and PSI 1511 valve springs and shorty headers not to take it to 6000 rpm or it would spit the crack and rods out of it, Ya I shifted it at 6200 with the 6.4 cam and 6500 with the custom cam and long tube headers and SRV intake and hit the fuel cut off at 6800 quite a few times over the last 10 years. I think this 5.7 would pull hard right past 7000 if I upped the fuel cut off. Yes they really suck these Hemi's.