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Cruising RPM 120-130

posted by  someone claiming to be John McPhail on  Sat Oct 6 08:37 CST 2012 [RELATED]

Can anyone help me figure out what the cruising RPM is for a '66 122S with M40 and stock rear end? Problem is, I can't seem to figure out what rear end ratio this car has. The tag is gone, and the 'net has conflicting info about which years had which ratios.

Trying to calculate cruising RPM for 60, 65, 70 and 75 mph. Going by engine noise alone, I would guess 3000, 3200, 3500, and 3800, respectively.

Thanks,
John






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