25/30 or 26/30

[phorj]

Hey all,

Not quite sure what to do... here's my prob.

I have a stockish R33GTS25t, only got cat-back exhaust... as we all know that just wont do!

I want to stap a 3L kit on it and shred some tyres!

I was wondering if was advisable to kit my RB25 head and put a 3L bottom end on it, or to try and get a hold of an RB26 head and do the same?

Is their really any difference one way or another? if so... what?

Is it going to be easier to put a 3L kit on either the RB25 or RB26, i know there are kits you can buy for the RB26, what about the RB25 - or will I have to source a block (VL style) from nissan and get the rest custom'd (to some extent)?

BTW, this will hopefully be getting done in the next 6 months or so after i sought out finance, feasibility, insurance, etc.

This is all part of my 'information gathering' phase.

Thanks for all the input, and sorry for wasting 15 minutes of your lives that you aren't going to get back!

Doug

[S13 Silvia]

The rb25de non vvt head is the one of choice if you go with the 25 head option. I've seen the 26 head on 30 blocks but they cost a lot more than a 25de head. I've heard that complete rb25de's go for $1200 and when I asked my local import wrecker how much it was for a 26 head it was some extravagant price (I forget) but it was more than double the cost of the complete 25de engine. Other people on this board will now a lot more than me but I'd imagine that the only benefits of the 26 head over the 25 would be better flow characteristics and the individual throttle bodies. Also, I've seen rb30e's out of skyline's and commodore's selling for $150 in the paper. Hope this helps.

[phorj]

thanks for the quick reply S13 Silvia

I was thinking on just going with the RB25 head, but if there was a major +++ for me getting a RB26 head I would!

Which are the non VVT heads... ser1, ser2, or can't you tell that way - are there a mixture of both?

This now brings another question to mind... how could I tell if it is a VVT head or not?

Thanks,

Doug

[S13 Silvia]

I'm not too sure on the finer points like how to tell wether it is a VVT head or not. Maybe the rocker covers have a bump in em like other vvt engines but I'm not sure. I think if you use the VVT head's, you have an issue with connecting an oil pressure line and an ECU issue......I think.

Have a search through these forums if you haven't already as there's a lot of info on RB30's as I found out when I was looking at it before.