"06" predator 90 head torque

I need the torque spec for the head on the 90. The nuts came loose and bluw the gasket. Or better the service manual.  
Heres my toys
YFZ450 "06" jet kit, zip tie mod, cam mod, sold
Raptor 350 "06" stock, sold
Predator 90 "06" stock, sold

What size are the head studs/bolts? a 3/8 high tensile stud could take up to 55 ft/lbs. If its a 5/16 stud it would be 35 ft/lb max.  

8mm studs, I dont see any markings to indicate the grade.  
Heres my toys
YFZ450 "06" jet kit, zip tie mod, cam mod, sold
Raptor 350 "06" stock, sold
Predator 90 "06" stock, sold

answered your private message to me.  
Keep it RUBBER SIDE DOWN!!

Most studs in engines are high tensile and good enough quality to be reused many times. I wouldnt go more than 20 - 25 ft/lbs and preferably the lesser torque. If it still feels like its tightening you can go to the high limit of 25 ft/lbs. But if it feels like the stud is just stretching then stop at 20.  

Thanks atomant,

Thats is where I torqued them (20'#). It is a great thing to have you guys to help, that means you to Wolf1.

Now I am looking to increase to power on this 90. Read some info about milling the jug down to tighten the clearance between the head and the piston. They say about .040 off the cylinder will give a noticable difference. Then maybe a different rev limiter, bigger carb and performance pipe. Any other ideas? I love to read this stuff but can not afford much at this point.

Thanks again  
Heres my toys
YFZ450 "06" jet kit, zip tie mod, cam mod, sold
Raptor 350 "06" stock, sold
Predator 90 "06" stock, sold

Save your money and buy a bigger quad. In the meantine keeping the tires inflated properly and the air filter clean and the engine in good tune is the thing you could do for performance.