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I have a 67 330 and what I read is that 's how you tell the difference between 66 & 67 was exactly that.I'm sure it had to be balanced without it.Check the pulkleys and see if they have any balancing marks
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1969 Cutlass S Holiday Coupe
1973 Ford Gran Torino
1982 Camaro Z-28
1994 Ford Lightning
1995 F-150 Supercab
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