zetor 4321

I'm hoping someone might have a torque spec for the head bolts? Maybe a diagram for the tightening sequence as well? There is a dealer of sorts here in town, but they aren't much help.

Have my tractor search down to a Mahindra 6520 or Zetor 4321. Both seem to be very comparable in hp and etc. Zetor is a new (full warranty) old style and is much cheaper, $12000 compared to $20000. My concern is the hydraulic clutch and brakes, seems to be a lot of problems discussed here...