R33 Gtst Head Work

[Bruno P]

Hi all Im basically needing some help, info and suggestions in regards to doing some head work on an r33 gtst head

I've rebuilt the bottom end about 5 years ago, forged piston conrods etc the car currently has 297rwkw and i was thinking about getting some head work done like a port and polish but not my area of expertise

The only thing I did to my head when i rebuilt it back then was Tomei poncam 256 duration by 8.5 lift, as it was the only cam available at the time that were drop in that didnt need upgrading of valve springs.

So im thinking of porting and polishing, was looking at Tomei type B valve springs with retainers, not sure if I should go single or double, possibly oversized valves, and Tomei Pro Cams Solid

As this is a street car i dont want it to be too rough but am wanting some more power as the car is currently only on 20 psi and really wanna be getting around 26-27 psi but in saying that I do have a Garrett gt35/40r with a .86 housing or something as the car is manual.

Can anyone out there give me some suggestions on what size cams, valves springs and different brands to go for example Procams. 260 0r 270 degrees? 9.25mm or 10.25mm inlet exhaust as Im just trying to get my head around what to choose from and remembering trying not to spend the maximum but still trying to keep it street driveable. Will my current poncams be good with a port and polish or are they time wasting. Also as I didnt O-ring the block I was wondering If anyone out there has ever o-ringed the head, Is it possible?

Does anyone know of anywhere in Melbourne that can do change over heads instead of having car off the road for ages also?

Any info or feedback will be appreciated.

Regards

Bruno

[Bronx]

any work done to your head will be major $$$$, if you have the right tools, you can do it at home. its not terribly hard if you know what your doing.

other than that, getting your head rebuilt, wont give you intense gains in power, you can always run more boost if you want, your engine can handle it.

the furthest i would go with cams for street driveable would be 272 cams at pure max. unless you like sounding like a tractor or need little to no power low down....

[Bruno P]

ok fair enough I thought most people do some knid of head work to the Rb25 heads but according to a few people i spoke to they did recon these heads do flow exceptional and that porting will basically only give you more mid range power but not really any top end power.

Any other feedback?

any work done to your head will be major $$, if you have the right tools, you can do it at home. its not terribly hard if you know what your doing.

other than that, getting your head rebuilt, wont give you intense gains in power, you can always run more boost if you want, your engine can handle it.

the furthest i would go with cams for street driveable would be 272 cams at pure max. unless you like sounding like a tractor or need little to no power low down....

[N1GTR]

Don't bother.