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First looking at pictures it is sometimes hard to see the whole picture. But this looks like what a will call a flat chamber and does not have the depth that the 426 did. This is something that was done in the D-5 heads. It reduces surface area and needs less of a piston dome. With the chamber and piston shown what is the CR. Have you looked into thermal coatings for the head and piston? Also as automotivebreath said on the sides of the piston what is the piston to head clearance? This can to used as a squish area.
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