Cam

Those lift figures are most likely at .020 (advertised) duration, not .050. Still big though ;)

My Mini-Express mushroom-lifter cam with .654" gross lift was originally 316 advertised, measured at [email protected]. After a light regrind to restore lobe taper, .652", 312 adv, [email protected].

Anyhow that advertised duration doesn't tell you very much about the acceleration on the flanks so as mentioned a dial indicator and degree wheel is your friend here. I'd guess it's in the 270's somewhere but who knows...