Rb30/25 Oil Restrictor Question

[GTRNUR]

Hi Guys,

About to have my RB30/25 assembled and I've come accross an issue...

I have a pair of Tomei oil restrictors for the block and I am using an RB25DET head. When reading through the catalog of Nengun as we sometimes do I came across the restrictors and read the following:

- Combine with STD orifice to use

For RB25&20, ONLY solid type is available

(cannot used on lash type)

This had me thinking, does this mean incompatible with the hydraulic lifters in the RB25DET Head?

It does make sense the head would require more oil pressure at high RPM to ensure there is enough pressure in the lifters...

This brings me to what are my options? I've heard of people adding an extra oil return to the sump from the rocker covers to help stop oil filling the covers. Also, drilling the oil return oversize.

What about conversion to solid lifters with a diferent cam shaft setup? Should I consider this upgrade and kill 2 birds with one stone?

Cheers,

Ian

[r33_racer]

you can put the oil restrictors in with no worries....we had 1 x 1.5 and the other blocked off.