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Hks Gtr Cams Into R34 Gtt

drgnball34

By drgnball34,
in Engines & Forced Induction

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shanef Grand Master

shanef

Posted
Posted
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 Rising Star

drgnball34

Posted
  • Author
Posted

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 Grand Master

shanef

Posted
Posted

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 Rising Star

drgnball34

Posted
  • Author
Posted

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 Grand Master

shanef

Posted
Posted
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 Mentor

Spoolup

Posted
Posted (edited)

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 by Spoolup
Spoolup Mentor

Spoolup

Posted
Posted

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.

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