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I used to have a cast iron "hemi" tach drive which I ran in my 440.
If you can't track the number, "spring" the rotor and see which way it goes. The BB engines rotate CCW, so if you can move it CCW, it fits a BB.
Then the second thing to find out is whether it's a long shaft--for raised block or hemi's, or a short shaft, for low blocks, like 383
If the rotor moves CW, it fits a small block.
I 'spose' there's some possibility it fits some early hemi.
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