Thread: How do I determine the number of flywheel teeth?

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Based on the casting numbers, this was in a mid-70's GM truck, but I don't really know for certain. I have no idea of the diameter; I was hoping that someone might know of a simpler solution than pulling the engine. I saw a recent article (don't recall where) that showed how to count the exposed teeth through the starter hole to determine which of two possible tooth counts you had (on a hemi, I think).

I should have added that this is backed by a TH-350, not a clutch.

The only flex plates I see available for a mid-70's 400 are 168 tooth. My guess is that's what you have.

If you are going to count teeth.be sure to paint a white mark on 1st tooth so you know where you started...sounds simplistic, but sometimes the simple answer is the best answer.

I got up to 151 and lost track of the tooth I was on.