Supertec Racing engine block oil restrictor controls the amount of oil flow that is delivered to the head which prevents over pooling of oil which becomes more of an issue with higher flow/pressure oil pumps are used.
By carefully controlling the oil flow to the head you minimise excess blow-by gasses, prevents oil leaking out of valve stem seals, reducing air pockets in the oil system during lateral loads, helps with insufficient oil return back to the sump where oil deliver is critical to the crank main and big end journals.
Fits all RB series Engines.
Available in the following sizes to suit your given application. 1mm, 1.1mm, 1.28mm, 1.5mm and blanked for RB20-25.