Nissan RB Oil Gallery Block off inc Tap BitRB Oil gallery threaded bungs. A much needed product when building a Nissan RB engine. The main oil gallery in all RB RD blocks is sealed from factory with a steel straight walled plug, it needs to be removed for the gallery to be cleaned before a build. We've designed a set of custom size threaded oil gallery block offs and have included a tapping tool in the kit, no drilling required before tapping other than drilling a hole through one bung to
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