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yeh there vct, im just wondering about the whole flow capacity of them seeing as the silvertop's heads rnt the best at it.. did they fix this problem with the neo? If it flows like a 25neo then it could be a worth wild upgrade... im asuming its going to be pretty much the same as fitting an sr20ve head to an sr20det with oil feed line's etc

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They are shit...dont do it!!!!

Because i have one with Tomei 2.4 internals that i am looking at running....one day when i am in Australian long enough to enjoy.

I have Tomei solid lifter conversion that i will also use and i will run some R34 GTT Tomei Poncams. I have not put a NEO head side by side but it only runs 9.5:1 compression so it seem perfect for a 2.4L as when you increase the diam of the combustion chamber to suit the larger bore you lower the compression...so will work out well. I am a bit concerned about the stud pattern on the inlet side as i expect like the RB25 NEO head which does not accept R33 RB25 inlet plenums....the RB20 NEO will be problematic with inlet manifolds

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I would say yes there is difference.

NA R34 NEO RB20DE has 2 intake pipes for providing air into intake plenum vs R32 RB20DET with one. So stock RB20DET turbo J pipe with BOV won't work.

Here's the photo's -

m0007.jpg

m0009.jpg

Unless you run 2x RB20DET throttlebody, throttlebody cable, etc on the intake plenum????

NA R34 NEO RB20DE ECU should be retuneable with Nistune like R34 NEO RB25DET ECU.

This is the R34 NEO RB25DE head vs R34 NEO RB25DET head thread on Nico forums -

http://forums.nicoclub.com/zerothread?id=470719

Ports are bigger on turbo R34 NEO RB25DET head. R34 NEO RB20DE head is probably the same as R34 NEO RB25DE head that has smaller ports.

But with a bit of porting, etc, maybe R34 NEO RB25DET intake manifold might fit on R34 NEO RB20DE head????

Edited by SKYPER
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Looking at the difference between the 2's port size's kinda makes me question the de heads? Would it actually flow better going by the size or would it need abit of machining to get it up to scratch? Im actualy running a redtop 12 port head which again looks alot different to the ones pictured on nico..

Edited by Justa32
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