Flywheel application

[69L72RS]

Found a counterbalanced 168T flywheel on the shelf.

Cast #3973457N date looks like A131.
It is tagged as "Nodular 400/454".

Is this a 400 flywheel or a 454 flywheel?

Thanks,
Eric

[Mr70]

That's all 1970-74 454's w/Manual Trans. application only.
168 teeth dated January 1971 31st day.

[69L72RS]

Thanks Rick