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Originally Posted by Oldsguy
The nickel content statement is fact ........
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Until someone produces some documentation, it's just another internet myth.
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........ blocks with an "F5" or "F6" cast on the rear face, under the flexplate area ........
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They would be 1972 to 1976, or so.
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........ These are commonly 1967 to 1970 or so 425 or 455 blocks"
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They would be "F1" and "F2".
Norm