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I have a 440 bored over .060, cross-ram intake. According to my axle size 3.73 gears, tire dia. 28 inch and final drive of the trans which is 1. At 60 mph my tach should read about 2900 rpms. I'm reading about 3900 rpms. I have the tach wired in the MSD rev limiter.
I have a new Pro Tach. Any...