Gtr Head Info

[MJTru]

Hi mate.

I have a 1995 Nissan skyline with an RB25det motor.

Now the car is highly modified. One of the problem’s that I’m experiencing is hydraulic lifter failing. I run about 30psi with a Haltech E.C.U. I’m sick of this lifter set up, and I’ve learnt that the GTR has solid lifters. Now I have heard of RB30’s running GTS-T head’s.

Now is it possible for a GTS-T to run a GTR head.????? (RB25DET block using GTR head)

I would like to use the solid lifter setup because of the speed in witch the RPM’s rises.

Do you guy’s feel that this is the solution to my problems. After about 4500 rpm’s it’s uncontrollable. It just bounces of the redline mark. (7500)

I know if I get rid of the GTS-T head, I will be loosing VTC. Well the motor right now has a stock head, and I’m planning on using some cams in the GTR’s head if I can use it.

If this is possible can you tell me what modifications I will have to do to get it to work?

Thanks mate.

[FineLine]

Yes you can run the 26 head on the 25. You will need to have the head stud holes in the block tapped out as the 26 uses a larger diameter head bolt/stud.

You will also need to change your complete intake assembly and the exhaust manifold. Both hot and cold sides use a different bolt pattern to the 25.

Or, You could do as I and others have done and get a solid lifter conversion for your 25 head. do that and you have a "26 head" that takes all your 25 gear.

[MJTru]

Yes you can run the 26 head on the 25. You will need to have the head stud holes in the block tapped out as the 26 uses a larger diameter head bolt/stud.

You will also need to change your complete intake assembly and the exhaust manifold. Both hot and cold sides use a different bolt pattern to the 25.

Or, You could do as I and others have done and get a solid lifter conversion for your 25 head. do that and you have a "26 head" that takes all your 25 gear.

Thanks Mate.

So seeing how i have to change all manifold hot and cold side, it would be easier to just convert to solid set up.

I have a problem finding some one that can do it. I tried RED RACING, But it seems like they are just to busy. They never reply to me.

Who did yours????

Well can the GTR's solid lifters work in the gtst's head.???? or do i need tomie set (witch i had in mind.) What would the valve clearance be with the solid set up.????

I was planning on building the head with 1mm over size valves, new guides, valve and springs with retainers, solid lifter convertion, port and polish, and new cam's.

I'm willing to spend 5k on the head if need be.

Thanks agian mate.

[waxracing]

You dont actually have to modify the head studs the 25 studs will work just fine.

But everything above the top of the block needs to be changed

[rob82]

Probly be easier and possibly cheaper to do a neo head conversion as have solid lifters like the GTR std. They are the pick of rb heads IMO.

Edited December 27, 2010 by rob82

[R31Nismoid]

yeah, neo head is another option, give it a port and so on as well before putting it on.. easy done.

[Aberax]

If you want to turn your current head into a Solid Lifter, you can use these

http://cgi.ebay.com/ebaymotors/Supertech-Valves-Nissan-RB25-RB25DET-Solid-1mm-Over-_W0QQcmdZViewItemQQhashZitem3ca78d9b7fQQitemZ260509113215QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/Supertech-Valve-Springs-Retainers-Skyline-RB25-RB25DET-_W0QQcmdZViewItemQQhashZitem3a5209405aQQitemZ250484441178QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

I am either thinking of using these myself with my build, or just staying with Hydraulic Lifters. Most likely stick with Hydraulic Lifters myself as my car isn't a major track car.

[FineLine]

Thanks Mate.

So seeing how i have to change all manifold hot and cold side, it would be easier to just convert to solid set up.

I have a problem finding some one that can do it. I tried RED RACING, But it seems like they are just to busy. They never reply to me.

Who did yours????

Well can the GTR's solid lifters work in the gtst's head.???? or do i need tomie set (witch i had in mind.) What would the valve clearance be with the solid set up.????

I was planning on building the head with 1mm over size valves, new guides, valve and springs with retainers, solid lifter convertion, port and polish, and new cam's.

I'm willing to spend 5k on the head if need be.

Thanks agian mate.

I used the supertech setup supplied by Big bad Dan at Elite racing. Its a comprehensive kit inc, o/s valves, dual valve springs, solid buckets,titanium retainers etc.have had zero issues with i to date so its all good as far as I'm concerned.

The neo head is another option but it too suffers from different bolt patterns on the intake side, different coil pack etc.

It can all be done. Just depends on what stage you are at.

If i were starting from the ground up I would probably use the 26 head but as I already had my hot and cold side sorted it was easier to convert the 25 head to solid operation.

[MJTru]

I used the supertech setup supplied by Big bad Dan at Elite racing. Its a comprehensive kit inc, o/s valves, dual valve springs, solid buckets,titanium retainers etc.have had zero issues with i to date so its all good as far as I'm concerned.

The neo head is another option but it too suffers from different bolt patterns on the intake side, different coil pack etc.

It can all be done. Just depends on what stage you are at.

If i were starting from the ground up I would probably use the 26 head but as I already had my hot and cold side sorted it was easier to convert the 25 head to solid operation.

Hi mate

Can you provide a link with the setup that you mentioned.

I'm saerching for it with no luck. With the 5k i have for the head build, i feel that the set up that you mentioned makes a lot of sence.

Its a comprehensive kit inc, o/s valves, dual valve springs, solid buckets,titanium retainers etc

This kit do you have a link for it.???????????????

Thanks in advance mate.

[Aberax]

Hi mate

Can you provide a link with the setup that you mentioned.

I'm saerching for it with no luck. With the 5k i have for the head build, i feel that the set up that you mentioned makes a lot of sence.

Its a comprehensive kit inc, o/s valves, dual valve springs, solid buckets,titanium retainers etc

This kit do you have a link for it.???????????????

Thanks in advance mate.

http://cgi.ebay.com/ebaymotors/Supertech-Valves-Nissan-RB25-RB25DET-Solid-1mm-Over-_W0QQcmdZViewItemQQhashZitem3ca78d9b7fQQitemZ260509113215QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/Supertech-Valve-Springs-Retainers-Skyline-RB25-RB25DET-_W0QQcmdZViewItemQQhashZitem3a5209405aQQitemZ250484441178QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

That is what the kit will most likely consist of.

[MJTru]

please look at the link i provided, and let me know if these parts will work with converting it to the solid set up.

http://www.imageinmotion.com/SUPERTECH01-SPRK-TS1015-RB25.htm In addition to the parts in your link on ebay.

Thanks mate.

[Aberax]

please look at the link i provided, and let me know if these parts will work with converting it to the solid set up.

http://www.imageinmotion.com/SUPERTECH01-SPRK-TS1015-RB25.htm In addition to the parts in your link on ebay.

Thanks mate.

If you have a look at the part numbers in your link and what I linked you to on Ebay, it looks like it is just the Spring Kit, not a "whole" kit of Springs and Valves.

You would also need the Solid Lifter Intake Valves and Solid Lifter Exhaust Valves.