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Head Work Recomendatoins

rinmak

By rinmak,
in Engines & Forced Induction

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rinmak Proficient

rinmak

Posted
Posted

Hi Everyone.

I have an RB25 here that will eventually find its way in to my S13. Due to unforseen circumstances Im now considering taking the head off of it before dropping it in so im after some opinions on what to get done.

Firstly, my goals for the motor

- Turbo: GT35R 0.63 A/R Ex

- Intake: Plazmaman plenum with (obviously) standard lower runners

- Power target: 400rwhp

- To be used on the track occasionally for drift (response), but mostly a street car until the cops catch me.

- Motor has 80,000km's and compresion tested to 165 on all 6.

Now I was thinking of getting the following done:

- Surface decked

- Intake & exhaust ports ported

- - Is this necessary/beneficial?

- The holes where the two snapped studs were need to be filled, drilled and tapped again. (kinda made a mess of them)

- Poncams installed

- More than likely some new springs

- - What would you recommend? RB26/GTR springs? Do they bolt in

- Head cleaned (i think they acid dip it right?)

If anyone can suggest any other work they think I should have done when its out then please let me know. Also if you have any input (positive or negative) on the above points then please share. The main thing Im wondering about is the upgraded springs, because then I could sell of my baby poncams and try something bigger (safely)...right?

Help!!!

Thanks

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https://www.sau.com.au/forums/topic/191495-head-work-recomendatoins/
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humz Proficient

humz

Posted
Posted

i think its a waste of time for your application to port/ polish, they are generally great from factory, maybe a lil clean to get rid of cast blemishes.

valve springs i would recommend, even tho i dont think its necessary for your power application.

i used 256 pon cams, straight drop in no mods needed. the larger stage 3 cams need machining to fit.

saber in perth did my head work, they are very good, pm me and i can pass on my details

good luck

rinmak Proficient

rinmak

Posted
  • Author
Posted (edited)

Thanks mate PM sent.

Anyone recommend what springs to use? Ive heard GTR springs drop in but would they be necessary/beneficial with my baby cams (poncams 256 8.5mm)?

Edit: Ok a search of these wonderful forums proved me wrong, GTR springs are not a bolt in for an NVCS 25. Can anyone recommend an alternative aftermarket product?

Edited by rinmak
Jmaac Proficient

Jmaac

Posted
Posted

Stiffer springs are really needed for these cams. Dont worry about port and polish, cleanup & deburr will do just fine.

Not sure about springs but you could always upgrade to solid lifters if u have the spare $$

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