Rb30/25 headstuds

[Ak brar]

Hi everyone 

I purchased r32 with 30/25

300kw on 98 

im planning to turn it on 85 

i was changing rocker gasket and noticed  

there are std studs  😞 

so can i just turn it on e85 with changing them ?   And keep it under 400kw ?  Is it safe ?  
does anyone using std studs upto 350kw or 400kw? 

[Murray_Calavera]

Why not swap the studs one at a time without removing the head?

[Ak brar]

Yeah I will but  which studs i need to buy?  25 or 30  and length?

[Dose Pipe Sutututu]

I reckon pull off the head and replace the head gasket.

If standard studs/head bolts were used, I feel there's a chance an OEM style head gasket was used.