An 8-cylinder V engine is fully balanced mechanically if the crankshaft as a unit is balanced and all the conrods and pistons have the same mass. The only other proviso is that the crankshaft to have the big end journals at 90degrees to each other. This is by far the most common. A few have the...
Nylons tend to absorb water and will swell slightly. I would be more concerned with the changes in temperature.
There are available lock nuts that have an embedded "circlip" where the nylon usually is in a "Nylok" nut. The circlip is flat but when installed, it is forced to...
The length of a spanner would be a compromise between the force needed on the end to provide sufficient torque and how it fits into its environment. Many motor mechanics prefer shorter handled spanners since they are less likely to interfere with other components in a crowded engine bay as they...