R34 Head Opitions

[devilsknife]

hi guy just wondering what setups have people used with there Rb 25det neo head? i.e valves, springs, cams

as my goal is about 700hp at the wheels i've been searching around for cams that will be able handle it. and cam spring have been so hard to find for the neo head any help where to go and what ppl used?

[Gerg_R31]

ferra parts;

springs to suit 11.5mm lift (you will want extra lift to prevent the spring bottoming out or valve bouncing)

stainless steel valves (they are a +1mm valve head size)

titanium retainers

valve locks (aka collets)

spring base locator

(these parts wont fit with any other brands like supertech or even the standard parts so pretty much you have to buy the whole lot, fabre are the only known ferra suppliers that im aware of)

RB26 cams 272 advertised duration and 10.8mm lift, common with just about any cam grinder (camtech tomeii hks etc)

(have 3-4mm lathed off bottom of buckets or they will bottom out)

flow bench ported head + port match intake manifold (dont port match the exhaust to head manifold) 4 - 5 angle intake seat radius with 1mm 45 seat

neo heads have a smaller chamber and the cc's are around 53-56cc's, make sure you check piston to valve clearance if not get the pistons flycut/ releived to maintain the minimum 0.080/ 2.03mm

how do i know all this? i've personally built a couple of these neo rb25 heads at work and thats pretty much the "all out" max you can go with the neo heads, (dont ask me the price i avoid that side of the job)

[devilsknife]

cheers man i have a account with faber so ill ring this week and then ill post product numbers for anyone who wants to go down this path