Cooler running spark plugs are essential when turning up the power on most engines , not only being cooler but being a better perfoming pug will always help ignite the fuel air mixture.
We have used these plugs succesfully at the 360HP area without issue , much more than that and depending on the engines use it will maybe need a cooler plug again.
General Details:
Diameter [mm] 14
Spanner Size 16
Tightening Torque [Nm] 22
Weight [g] 48
Spark Plug 1 - Earthed Electrode
Thread Size 1 26.5