We usually ship all orders within 1 day unless there is an issue with the order. In that case, we will contact you to find the best solution.

We are one of Tomei authorized dealers - Kure International, Inc., Please shop with confidence.

Engine: RB26DETT / RB25DET and RB20DET with Solid Type Camshaft Engines

Tomei orifice 1.5mm restrictor (Stock orifice 2.0mm restrictor).
To be used with stock 2.0mm restrictor orifice together.
This orifice also works on RB25DET and RB20DET Solid Type Camshaft engines. (Not to be used on Lash Type RB25 and RB20 Engine).


The Orifice controls the amount of oil flow that is delivered to the head to lubricate the parts in the cylinder head and to cool down the engine assembly.
However, the stock oil-gallery orifice has a hole that is too large which allows too much oil to be delivered to the cylinder head which will cause the problems as listed below:
(1) Too much blow-by Gas
(2) Blowing engine oil
(3) Leaking oil through the valve guides
(4) Insufficient oil delivery to the crank journal,
(5) Allows air pockets into the system from when the oil pan is under horizontal G-Forces.