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Yes, I searched this topic and read pages of threads. I've concluded there is no single correct answer.
I've got a 94 LT1 5.7L from a Buick Roadmaster. I had some new Bosch R6 [HR8KII33V] plugs and tried to determine if they might fit this motor. No luck. So I decided to go to ACDelco. According to rockauto.com I can use the 41906 [gapped at .050] or the 41902 [gapped at .060].
Does anyone have a preference and a reason for going with one over the other?
 
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