the way i understand it the oil hole is blocked by the bearing cage,correct me if that is wrong.i just can,t see any reason anything other than pro stock would need roller cam bearings,and really doubt they need it but if one does it they all do it.i built quite a few bbc that went 8700+ rpm and never had a cam or cam bearing failure.

most all of the prostock setups do not run any oil to the heads, they pour enough for the next pass, knowing the valve covers are coming off right after, and the don't drive to lanes or back anymore...so not much lube needed for 3-4 mins. as well as being dry sumps to.

i guess they get away with that .they change valve springs every pass.

thats true most due now, at least check pressure on them at a min...but when you turn all that heavy stuff north of 11k...