got it figured out.
The smog chamfer is there to make it a universal 67-79 400 piston. same goes for the 8 VR
The dome volume (8 VRs 10cc.+the chamfer = 15cc.
The pin height is 1.70" vs 1.714" for the 4 VR piston. The sealed Power piston has the same pin height for the 5 bore sizes available.
info obtained from summit and Crocie Jr.
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