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From what I remember, I want to say all 428's were externally balanced, but only the 428SCJ needed the "hachet" for the heavier "LeMans" connecting rods.
427's came with cast and steel cranks, but I think the cast cranks were lighter, and revved easier with some performance advantage.
I'm not sure if the piston reliefs on the top of the pistons are the same for a FE and a BBC, so even if the bore is the same, they may not be optimal, unless you're talking about a flat top.
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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