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I have not used the Bosch plugs in my LT1 but I really like the NGK TR-55 Double Platinums. :thumbsup:
 

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If your O.E.M. wires have more than 60,000 miles on 'em they're likely on their way out and should be replaced, too.

Ditto for the wire holders/separators. They get brittle from the engine heat and crack, break, etc... :thumbsup:
 
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