If the engine is used for any form of racing or extended wide-open-throttle sprints, USP highly recommends upgrading the spark plugs for engine longevity and safety. USP recommends upgrading the engine’s spark plugs to NGK Laser Iridium Max+ Performance Spark Plug.Īll spark plugs come pre-gapped with a 0.8 mm (0.0315 in.) gap. This is vital to remove heat from the cylinder head in the Mercury Verado engines. The NGK Laser Iridium Max+ Performance Spark Plug spark plugs operate at one heat range colder than stock, which results in better pre-detonation resistance and spark plug life under extreme conditions. Energy is transferred from the ignition coil to the plug which creates a spark igniting the air-fuel mixture. Spark plugs are responsible for providing an ignition source inside your engine’s combustion chamber. The use or installation of this product outside of the intended closed circuit racing purpose may be illegal under the Federal Clean Air Act (42 U.S.C.
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