I just received a quote from a supplier for a spring upgrade I need to do for my new engine. I bought these Dart Pro 1 heads a while back, and I am going to use them on my new engine. Well, they came equipped with "hydraulic roller" springs. So I am using a solid roller. Springs should be good right-no! I thought because the lift was not that excessive that the existing springs would work. I researched, and no; I would be asking for trouble (springs/valves-dropped valve-not worth the risk) and decided I would have to upgrade. Remember, all this shit is new and never been used. So this is another $700.00. And....I still need the proper lifters (needle-less solid rollers), pushrods, starter, oil cooler, and some etc. of course. I will have a brand new set of roller cam springs, spring cups, locks, and retainers that I can put in "stock" though-forever probably. My thought is this, it better make 800+. The turbine is looking better all the time.