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This depends on what cyl head you are using. RB20/25 heads are made to suit 10mm head bolts/studs where as the RB26 is for 12mm. Std RB25 and 26 have the same bore of 86mm so if you have a std bore you can use a std bore gasket from either of these engines depending on what size head bolts/cyl head you are using. If you have the RB26 head and have built your RB30 bottom end with either a 86.5 or 87mm over bore which I think you do you should get the tomei 87mm gasket kit. This comes with the 1.5mm oil restrictor you should use with your N1 oil pimp and all intake gaskets.

On one RB30 I built with a RB25 head I used the 25 std gasket and another with the 26 head I used a tomei 87mm. No different than building the engine to whatever head you are using unless you are running a neo or other VVT oil feed then you need a VVT specific head gasket.

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