Moroso offers different thickness spark plug washer kits to do this. Some theorists claim positioning the electrode in relation to the intake or exhaust valve may also be worth some power—at ...

which defines the valve interface for 18 and 26-mm valves with plug-in electrical connections. A wide range of pneumatic functions gives flexibility to users. Electrical interfaces include ...

While supercharged Three-Valves can be tuned to make great power on pump fuel, a lot is left on the table because of the overall inefficiency of the spark plugs once boost gets at them.