1948 Oldsmobile Futuramic Denso (5304) IK20 Iridium Spark Plug, Pack of 1 $6.30 Six times harder than platinum, iridium doesnt melt in temperatures up to 4,000FBecause the iridium electrodes of these plugs can be shrunk to only 0.4mm, voltage requirements decrease while firing performance improves360 laser welding of electrode provides a seal that resists wear [...]
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