Rb25det Head With Rb30 Bottomend

[joe blo]

do i use rb30 or rb25 head bolts to put the rb25 head onto a rb30 bottomend

[craked]

rb25

[r33_racer]

If you want to drill and tap them out, you can put whatever you want in there!

[joe blo]

i just want to put ones straight in. so rb25 ones ey?

[Guilt-Toy]

i just want to put ones straight in. so rb25 ones ey?

yes. buy brand NEW ones from nissan for a Rb25det and you will be fine. so far mine have handled 31psi and 510rwhp

[TiTAN]

do you remember what nissan charged for the head studs vs ARP replacements?

[SLAPS]

yes. buy brand NEW ones from nissan for a Rb25det and you will be fine. so far mine have handled 31psi and 510rwhp

Damn.. you really need to get a set of cams in to that RB30DET.

Would be interesting if you could get a set of 260-265 9mm cams to pass emissions. 265/9mm idle baby smooth in my rb30det and picked up 30rwkw with some really nice mid range improvements on the same boost with 98 PULP. Power was only 'slightly' down under 2000rpm but not noticeable via seat of the pants when driving.

The power improvements I saw probably won't be reflected in your case due to E85. Would be interesting to see though.

All though 30 odd psi - as it came on would absolutely obliterate any thought of traction and would be rather fun. In my setup the cams improved the power as boost came on and made more power everywhere so the zero to all out boost transition wasn't so hard on the tyres as it loaded them up quickly but progressively.

I'm running Nissan headbolts and pushed 24psi running a Cometic MLS torqued down with my 25yr old torque wrench. No issues.

IMO 400-450rwkw+ and you really should start looking at 12mm + ARP head bolts to keep things together as combustion pressures sky rocket.

Edited May 1, 2009 by TheRogue

[Guilt-Toy]

do you remember what nissan charged for the head studs vs ARP replacements?

cannot remember for sure, but about $70 for the head bolts i think give or take $25