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Thanks for explaining! It is my rebuild topic that Eric made the comment on and I didn't really understand. Your picture with the reducer certainly makes it clear!

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I have my breath held waiting for the confirmation of 27CC's. Think you will have to consider the area between the piston and the cylinder and the depth down to the first ring and add that in.

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The domed piston volume will need to be calculate in Math, or in an assembled state at TDC, but Math seems easier and less error prone.

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Yup and that is a measurable distance. No problem with the adapter if using it to see the variation across your 4 pistons but not to compare to someone with a 12mm gauge.

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I’m wondering about how the 9.2:1 compression ratio is calculated. Is it static or is it dynamic? I don’t know, but I thought someone mentioned that a few years back. You would think that dynamic is more important to establish octane levels needed for safe operation.

Per the 1000 pistons, my measurements had them 0.040” below the deck. The valve pockets are considerably deeper. Interestingly, the 1200 pistons were 0.040” above the deck. Don’t anyone take this as gospel, my calipers are pretty beat up.

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Nice find Cliff. I can see many uses for that in your shop