I believe RB26 is 12-14 ft lbs. Rb25 should be similar if not identical...have just fitted cams to my 26, stretched one bolt to breaking point and broke one off in the head, had it removed today by thread doctor...$100 wasted thanks to a dodgey torque wrench...those bolts have almost zero stretch, be very careful, if theyre over-torqued/stressed they can fail during operation!
Heres some Tomei studs for 26, about half way down that page, US$210 -
http://www.tomei-p.co.jp/_2003web-catalogue/e111_bolts_.html
http://rawbrokerage.com/Tomei-Reinforced-C...8B.qscstrfrnt06
I just ordered a new set of bolts from Nissan, $3 odd each.