Thread: Plugs for Vortec heads
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Old 02-13-2020, 09:33 PM   #15
burnin oil
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Join Date: Jan 2013
Location: Eastern TN
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Re: Plugs for Vortec heads
605 is a slightly colder plug. Good for a higher compression setup. 606 are the correct plug and slightly warmer. They both work pretty well.
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