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By my count, it's 560 plugs for the pair. And an old timer told me that back in the day they were a buck a piece. What's that make a tune up in today's dollars???
It's 480 plugs. B-29 had 18 cyl R-3350 2 plugs per cyl. B-36 had $-4360 28 cyl 2 plugs per cyl.
The math is 18x2x4 + 28x2x6 = 480.
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