I have run hydro lifters to well past 7000. They were never intended to go 8500. I don’t really see any members here wanting to rev to 8500 with there street/strip builds. Sure there is some die hards doing it but they are not a typical street/strip build. The expense is way more then our street /strip builds. If I really ever want to go faster than 9s I’ll do a pro or super charger and still keep the revs to 7500 or less. Kim