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Big Phil has some stuff on his YouTube channel.


essentially there is no factory RB30DE, only an RB30E (sohc). The head on an RB30D is a head from certain RB20/RB25 mated to a 30 block.  There are other requirements such as running oil lines for VCT, etc.


youll find a bunch more info on Aussie sites as an “RB25/30”

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