Piggaz - the 25/26 heads have the half inch npt fitting between #3 & #4 from factory, (10mm hex key needed to remove it) the part number i mentioned screws straight in with a bit of thread sealent
I actually agree with gtr_joey,
If you weld AN fittings onto the sump in line with the cranks counter weights, as the crank moves downwards, the counter weights create a downward suction effect on the exhaust side,
On the intake it will create an upward push effect, which is why i want to move the rear drain to the intake side to act as a sump gas vent
Atm i don't have oil control issues, more planning for future as a "just in case it might happen" oil drains are drilled out in head and block, but didn't fit restrictors (no one had any available at the time)
number 6 piston does have piston knock on cold starts which does have a little blow by, but none after it warms up
(i re used my 3 month old forged pistons after valve float from shitty valve springs. Number 6 piston skirt had collapsed 2 tenths of a thou, and i didn't want to wait 8 weeks for a new set as it is my daily driver)
but yeah i'm aware that the drains are a "band aid effect" but thought someone may benefit from it if they dont want to pull a motor apart just to fit restrictors