Anything using an SFI certified racing harness that runs under 200mph. Valid for 5 years beyond the marked expiry date.
The ring gap allows the expansion of the piston rings in the bore – due to engine heat – without butting the ends up against each other.
Crankshaft balancing is just that, a balancing act. When an engine is running, there are many different forces working against each other that need to work in harmony.