r33skylinegts Posted June 21, 2011 Share Posted June 21, 2011 hey guys.can the rb25det neo bolt on the rb30.the pdf file states the water gallieries dont line up and that the combustion chambers are smaller.can anyone confirm this.if using the rb26 head will there be any negative effects using rb25 headbolts instead of drill n tapping for the larger rb26 headbolts.is it realy nessasary to use the crank collar if reving to a max 7200rpm. Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/ Share on other sites More sharing options...
JonnoHR31 Posted June 21, 2011 Share Posted June 21, 2011 the vct feed and neighbouring water gallery need to be welded in the head to suit the 30 block. 25 head bolts are fine for a mild motor crank collar isnt needed but its a good idea Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5876756 Share on other sites More sharing options...
r33skylinegts Posted June 21, 2011 Author Share Posted June 21, 2011 so the r33 rb25det and r34 rb25det neo are the same only diff is the neo head got solid lifters. Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5876939 Share on other sites More sharing options...
Rolls Posted June 22, 2011 Share Posted June 22, 2011 (edited) The combustion chambers are smaller on the neo and there are quite a few differences inside, highly recommend keeping the VCT Edited June 22, 2011 by Rolls Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5877665 Share on other sites More sharing options...
r33skylinegts Posted June 22, 2011 Author Share Posted June 22, 2011 so the neo head is not a straight bolt on to the rb30 block then. Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5878294 Share on other sites More sharing options...
Rolls Posted June 22, 2011 Share Posted June 22, 2011 so the neo head is not a straight bolt on to the rb30 block then. no more than the S1/S2 rb25 from what I've heard, quite a few people have done it. Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5878307 Share on other sites More sharing options...
bubba Posted June 23, 2011 Share Posted June 23, 2011 The only straight bolt on heads are RB25DE (R32) and RB26. Link to comment https://www.sau.com.au/forums/topic/368503-rb25-neo/#findComment-5879065 Share on other sites More sharing options...
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