Rb26 Head, Rb25 Bolts. What Washers?

[leeroy_25]

I am building my RB30 with an RB26 head using RB25 bolts.. May sound like a silly question but what washers should I use? The RB25 ones or the RB26 ones?? or does it not make much difference? The RB25 ones fit the bolt perfectly but presumably have a smaller bearing surface onto the cylinder head?

What's the norm?

Thank you

Lee

[proengines]

drill & tap the block to take the 12mm RB26 bolts or studs.

[Adriano]

I would use rb25 ones, they are good enough for 600hp

[leeroy_25]

Thanks man..

RIPs says the same.. Whe you guys' talk 600bhp I presume you mean flywheel power.. not at the hubs?

Cheers

Lee

[Adriano]

If you are after 450rwkw, then i would use rb26 arp head studs with the block machined to suit

[leeroy_25]

Hell no!

I'll be more than happy with that at the flywheel!

Thanks though.

Lee