Hks Gtr Cams Into R34 Gtt

[shanef]

really huh? Sounds major....The head is getting sent to enginering once my cams arrive. i hope there is a possible way around it and not have cost sky rocket at the same time. Is there anything even wrong with aluminum lifters anyway? It has a rb30 bottom end reving to 8k rpm max although power goal is 650rwhp...

cheers

too late now, but u sholda really sold ur neo head and bought a 26 head to start with

[drgnball34]

buying a rb26 head has been suggested although many of my parts are for the NEO head. Is there any reason why nissan only gave it 12 steel and not all of them? I am concerned about reliablity issues pushing big power.

[shanef]

depending what size cams u use, tomei recommened u use their lifters for the bigger cams

an extra ~$350 for brand new lifters isnt that much more to the total bill for a good quality build for decent hp, which is gonna be in excess of 20k+ anyway

do it the first time, do it properly

[drgnball34]

yes exactly. do it right the first time. I was aware that tomei do lifters although i am not too sure any are avaliable for NEO? I am using poncams 260.

[shanef]

what u should do is pick the turbo u want to run and then chose the head modifications to suit. caus my feeling is the 260deg cams arent going to get you to your goal of 650hp

[drgnball34]

it has rb30 bottom end with a t04z with 1.00 a/r, valve springs, guides, port & polish, plenum etc...I did the reasearch and asked questions. Lift bigger then 9.3 will not fit a NEO head. Pon 260 are the closet. Rev will be set at 8k rpm.

[shanef]

it has rb30 bottom end with a t04z with 1.00 a/r, valve springs, guides, port & polish, plenum etc...I did the reasearch and asked questions. Lift bigger then 9.3 will not fit a NEO head. Pon 260 are the closet. Rev will be set at 8k rpm.

u shoulda got the head clearanced for the bigger cams when u got the port/polish done u dope lol

[Spoolup]

The exhaust lifters arent aluminium but are titanium from memory.

NEO lifters are overhead shim, as opposed to RB26 which are under shim.

The lift issue has nothing to do with clearence problems, but is to do with the position of the lifter oil feed gallery that runs the length of the head. If the lifter is pushed down too far ( ie big lift cams ) the oil gallery is exposed and you end up with no oil pressure in your head. So there is a limit to the amount of lift that can be run when using the std lifters.

Edited December 13, 2007 by Spoolup

[drgnball34]

dope? lol

[N I B]

If you know the right combo you can use almost all GTR valvetrain parts in RB25s.

[Spoolup]

Thats an urban myth if your referring to the R33 VCT head, as the valve stems and lengths are different sizes, the guides are different, the springs are different . With major mods it can be done but it would be a pointless exercise and cheaper to buy a RB26 head.

If you know the right combo you can use almost all GTR valvetrain parts in RB25s.

[drgnball34]

hey steve..its pointed out that they arent aluminium....Can you go double check on my head mate?