Think that mod is more for high rpm endurance engine maybe super high rpm drag.
My cousin stock would hit 7000 rpm with stock oil system no damage over several seasons, lots on here rev well into mid/high 6000's without the mod don't any complaints.
yeah.. i worry too much and will stay under 6000.. (plus i have no idea how many miles are on my bottom end.. just grabbed something to run) my combo is just a mess at this point :) Plans changed mid build