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Rb26 Gtr Valve Springs In Rb25 Head

zac the muss

By zac the muss,
in Engines & Forced Induction

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zac the muss Explorer

zac the muss

Posted
Posted

just a quick question, is it possible to drop rb26 valve springs into an a r33 rb25de head?

I've done a bit of searching but haven't been able find a definite answer. the plan is to stay with the standard DE cams for now.

also is there any sort of quick check to determine the condition of the springs?

cheers

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https://www.sau.com.au/forums/topic/438010-rb26-gtr-valve-springs-in-rb25-head/
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nicksamaniac Collaborator

nicksamaniac

Posted
Posted

I can answer this,

Yes they do fit, they are the same physical dimensions od, id, and length.

They do however have a higher seat pressure, obviously why you fit them to a de head!

I have a rb30det using a r32 rb25de head with rb26 springs fitted, still under the de cams, which are far less aggressive in lift then 26 cams.

Far as I can research the de springs will only hold up to about 15-16psi of boost before unseating the valves at high rpm causing valve float.

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