Check my work-Chime in please
OK, can you move the piston back up to TDC, and then measure the CC's down in the block at that point? That will complete the data needed to figure this out. We can crosscheck this to the info given in the past for the Egge pistons.
And yeah, I expect the SCR and DCR to be lower with this info.... the Egge pistons are the lowest compresssion height of the available 4bbl 273 pistons.