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Rb30/26 Head Studs? Help Please

SJR

By SJR,
in RB30 conversions

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JH32 Grand Master

JH32

Posted
Posted

followed workshop manual.

If using RB25 head studs, RB26 head and RB30 block.. I'm assuming you torque the head studs down to the RB30 workshop manual specs, not the RB26 manual to suit the head or the 25 manual to suit the studs?

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R.I.P.S NZ
R.I.P.S NZ

You 'could' tap the block to 12mm but from experience I can tell you it its perfectly fine to run 11mm RB25 head studs with a 26 head. I've done alot of miles and drags with a best of 8.71 @ 162 with

Alf
Alf

I used ARP Rb26 head studs on my 25/30. Apart from drill and tapping the block the 25 head had to be drilled out to suit the larger head studs. I used the 26 studs as they were cheaper and available

JH32
JH32

Ah cool, cheers guys

luke gtr Grand Master

luke gtr

Posted
Posted

If using RB25 head studs, RB26 head and RB30 block.. I'm assuming you torque the head studs down to the RB30 workshop manual specs, not the RB26 manual to suit the head or the 25 manual to suit the studs?

no.

torqued to 26 specs.

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GTRPSI Mentor

GTRPSI

Posted
Posted (edited)

No Luke, the ARP 26 studs are torqued to 105 ft lbs in 3 steps, the RB25 and RB25/30 ones are thinner at 7/16th and done to 80 ft lbs in 3 steps.

Point being the 26 ones are thicker and the block deck stronger and thread area is larger and they can take more.

The RB30 blocks take less being a smaller stud and the rest, also the block deck may start distorting if overdoing it as they dont have much meat around the stud holes.

Instructions are below....

RB25, 25/2630 using a 7/16th stud etc...

http://arpinstructions.com/instructions/202-4301.pdf

RB26....

http://arpinstructions.com/instructions/202-4207.pdf

Edited by GTRPSI
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