How to measure milled heads
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I don't know if you can measure the head thickness to find that out. You could use a buerette and measure the combustion chamber volume. I believe it's ~.006" mill for every cc less than stock. I know the stock 853 heads were ~66.67cc's and I think the stock 243's are ~64cc's. I'm wondering if you could measure valve height from a flat edge across the bottom of the head, but I don't know what the dimension is.