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30/26 into 34gtr 

7 replies to this topic

#1 34gtr guy

  • Joined:28-June 11
  • Location:Australia QLD
  • Car:34gtr

Posted 28 June 2011 - 10:08 PM

hi guys new to the forum.so i bought a 34 gtr a few months back had a fair amout of work done to it i bought it out of sa.it had a jun stroker kit in it had a part fail on it so im now building a 30/26 combo for it i have most of the parts and from people that i have been talking to its a bigger job then i first thought.has anyone fitted a 30/26 into a 34 on here if so what problems have they come across? i have been told the bonnet has to be cut or is this only on the r32s? from what i have found out the engine will lift up by 40mm and the sump will lower by 10mm.is this true? ill up load some pictures as i go but if any one has some info would appreciate it thanks.also i will be selling off some of the old stuff if anyone is after anything pm me and i may be able to help i will have things like a jun crank and rods that have done 7500ks and have been tested that are in very good conditon still.a block but needs sleves set of nitto valves and so on. ill get some pics up soon tho for anyone that is looking to do the same thing.

#2 Edd-GTR

  • Joined:26-April 05
  • Location:Australia TAS
  • Car:1989 BNR32 GTR

Posted 04 July 2011 - 08:59 AM

The motor will sit 40mm higher and 10mm lower yes. You will need to adapt the GTR sump to fit the 30 block (many ways to do this, search.) Some of the oil feeds in the head may need to be blocked as they don't line up to the block (not positive on this with a 26 head, but I think it's the case with a 25.)

There is a heap of shit all over the net about this, have a search of some other forums and post in the tech section on here.

#3 Michaelgtst33

  • Joined:27-June 11
  • Location:Australia NSW
  • Car:Skyline r33 gtst

Posted 17 September 2011 - 02:47 PM

Just wondering if anyone knows the difference between a rb 25 and an rb 26 head

#4 hinto2

  • Joined:04-December 07
  • Location:Australia SA

Posted 17 September 2011 - 03:13 PM

26 has solid litters and shims and most likely flow better

#5 Edd-GTR

  • Joined:26-April 05
  • Location:Australia TAS
  • Car:1989 BNR32 GTR

Posted 19 September 2011 - 12:05 PM

View Posthinto2, on 17 September 2011 - 03:13 PM, said:

26 has solid litters and shims and most likely flow better

I'm pretty sure they don't have a solid head standard....

#6 blingcommander

  • Joined:05-October 06
  • Location:Japan
  • Car:Scooty-Puff Jr.

Posted 19 September 2011 - 12:28 PM

View PostEdd-GTR, on 19 September 2011 - 12:05 PM, said:

View Posthinto2, on 17 September 2011 - 03:13 PM, said:

26 has solid litters and shims and most likely flow better

I'm pretty sure they don't have a solid head standard....
26s do, so do neo RB25s

#7 Edd-GTR

  • Joined:26-April 05
  • Location:Australia TAS
  • Car:1989 BNR32 GTR

Posted 19 September 2011 - 04:12 PM

How did I NOT notice that when my head was apart.... :doh: :lol:

#8 Danzo

  • Joined:21-August 03
  • Location:Australia SA
  • Car:R32 GTR

Posted 02 November 2011 - 02:05 PM

26 head bolts pretty much straight up to a 30 block, can even use rb25 head studs as long as the guides are in good nick





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