8420A x 6 = A complete car engine set of Competition (hotter range) Spark plugs.

Original Equipment >  Champion Brand >  N12YC Heat Range   >  9:1 Compression Ratio.

This is a higher burning temperature than standard  road spec.  spark plugs, a listed for COMPETITION applications in XK engines. It is now  getting very difficult to track down suppliers of these excellent brand of factory O.E. plugs. These are improved over original spark plugs as they feature improved copper (C) cores.

Original Number C2460

NOTE : The N8 range of spark plugs are no longer available