yeah crank case is fine, but why when i had it in the head when i over revved it sucked the oil out and spat it in the catch tank, but when i blocked it off it didnt do it even after being over revved

you carnt install the thing wrong anyhow 1 under turbo, 1 to kidney box one cam cover into breather seperator and catch tank, ive always ran them on my cossies, but all did the same even on fresh engines after running