Or a .045" dish. Or a combination of dish and reliefs that add up to 4.5 ccs. The OP wanted to know what static compression would be needed with his particular cams to make 7.75:1 dynamic compression. So, we have to work the DCR calculator with the known values and adjust some piston values we can control to zero in on his answer. That just happened to be the dish/relief that works in this representation of the engine. Less piston relief/dish cc would be needed with thicker gaskets or less block decking as long as the quench was not dramatically reduced.
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