That's why.
I can tell you right now with 360 open, assuming its .5-.550 lift... it had to be around 140ish+ seat pressure. I'm not saying the seat pressure is the reason, it was open really. Just wanna be clear. Break in is done at 2200-2800 rpm... you dont need that much control...aka pressure... at break in rpms.
Hypothetically you could run 180lb seat with a solid lifter if you keep the open reasonable.
