Brisk Silver Racing spark plugs have a better ignitability than conventional performance spark plugs, and offer better performance and reliability in high boost, nitrous or high compression applications. Silver is an element with the most free electrons, and is the best electrical and thermal (heat) conductor of all metals! Better than gold, copper …and many times better than Iridium. The Brisk Silver Racing plugs have a fine wire center electrode (not just the tip), which gives more room for insulator between the center electrode and spark plug shell. More insulation results in a durable spark plug with high dielectric strength, which is the most important spark plug parameter in forced induction applications.
When you replace the spark plugs, always apply anti-seize to the spark plug threads and dielectric grease on the inside of the coil pack connector boots. This will ensure the plugs can be easily removed in the future and displace the air inside the rubber boots, which will in turn prevent carbon tracking and misfires under boost. We include four gram packets of dielectric connector grease and anti-seize lubricant with all spark plug shipments. Recommended torque value when installing in aluminum cylinder heads is 8 to 14 foot-pounds.
- OEM LF4 spark plugs are AC Delco 41-147, 12662396, iridium, gapped between .030 and .035″.
- RR12YS are approximately one heat range colder than stock, have projected tips just like OEM and come pre-gapped in the sweet spot of .026 to .028”. We recommend these for 14 to 19 psi of boost.