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Official sparkplug of NASCAR!
Premium Iridium plugs - 2 heat ranges colder than stock
Some would suggest Iridium is not ideal for high compression and they may be right...
Did these when I swapped out the intake manifold (easier access so was a good time).
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Installed by:Pro Installer
Autolite 5143's. Gapped at .65 with SD Coil pack and JBA wires
Nothing like the simplicity of the original 4 barrel Autolite!
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