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All I can say is my father and brother ordered two identical cars at the same time and they came with consecutive build numbers so one followed the other on the assembly line. My brother drove it like he stole it while my dad followed break in recommendations. Both had 383ci engines and my brother could always walk all over my dads and he had made zero mods. Two years later when I was in college same thing happened again this time with 340's one driven hard from day one and they were like night and day when they ran against each other. No Dyno's for hp proof but it was theroyised that it had to do with how the engine parts took an initial 'set' to each other.
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