340 4 barrel and 340 6 barrel: were they really UNDERrated?

GTX JOHN said

My Friend Rod Green's 340 Demon right of the showroom
ran 13.05 @ 105 with the stock Tires an zero modifications.

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Interesting. I knew somebody that bought a new 340 Demon, automatic with 3.91's and with 300 miles on it they ran it with slicks (slicks the only addition) and it went 14.20