I dont think ive ever used a torque wrench on a small engine head. I usually pick a pattern and do it by feel. Never had a problem.
so I guess its good he even used a torque wrench.
Somewhere in the real world there is a compromise between the theoretical and practical.
With experience, it is easy to know "How much is enough?" and "How much is too much?"
Does everyone use a torque wrench on every bolt on a small engine? ....If not, why not? ....Somewhere, there is a torque spec for every size threaded fastener.
Please keep in mind that these small engines are not high-rpm, blueprinted race motors that demand critical tolerances. ...The fasteners on these small engines are not stressed to their limits.
Torque wrenches, do indeed, have a useful purpose, and there are some applications were they should definitely be used.
The use of a torque wrench is very beneficial to inexperienced people to hopefully prevent them from over or under-tightening a bolt.
However, use of a torque wrench is useless if threads are not clean, and are under/over lubricated.