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R32 GTS-T
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16 Posts
Discussion Starter #1
Hi all.

Is it possible to fit RB25 head onto RB20 Block? I have noticed that there is a few RB25's with RB20 head conversions so i imagine the head and block will fit toghether. Is this correct??? If it is possible, would this conversion improve the performance of the RB20? What problems could occour with this?

Thanks for helping me on this


Cheers guys


Glyn
 

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1st RB20DET S13 in UK
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389 Posts
Tbh mate, ive never heard of anyone achieving this with any success (doesnt mean that it hasnt already been done tho)... its probably possible, but not gonna be easy.

The difference in bore size will cause some problems, but also IIRC the RB20 block will need to have the oil and water feeds to the head checked/modified, and the threads for the head bolts re-cut as i think the RB25/26 head bolts are larger diameter bolts...

IIRC there is modification needed to the RB25 head also, to match up the water/oilways...

If you could sort these things out, then im sure it would be possible... but there may be other problems you could run into that i havent thought of already.

Hope that gives you a better idea what your up against mate.:)

Nize.
 
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