I'm planning to buy torque wrench for securing engine head. I google/search everywhere but can't find a recommend torque for securing engine head. Any engine guru welling to share how many torque to apply? (I assume it's different for .12 engine and .21 engine?).

I wouldnt think so, the screws are all the same between the .12-.21, for novarossi anyways.

For the novarossi screws, i usually get them snug, not too tight, (tighten in a x-pattern to make sure ) the cheese head has a large bearing surface, alot of people will trade them out for SHCS but, you loose bearing surface with them. Hudy makes a screwdriver specifically for the nova screws. Its one of my favorite tools.

X pattern tightening, and torque between 0.9 and 1.0Nm

AFM

Great info. Thanks AFM.

I think buying a torque wrench is a little overkill. Just tighten it down in an x pattern. I recommend replacing the flat screws with socket head cap screws.