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Let's clear this one up right now.

The difference is NOT the outer diameter, which is all that matters fr a manual trans setup.

The difference is the inner diameter where the snout of the torque converter is supported.

This difference applies only to an automatic equipped car, not one with a manual trans. If you happen to have the early, smaller inner diameter crank and whant to run it with a later, large diameter T/C then you can machine the inner diameter out. If you happen to have a later crank with the larger diameter and you need to run it with a smaller diameter T/C then you need an annular ring to make up the difference. I believe Wildcat Auto sells them, among others.

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