it is a Diamond piston and they have several FE chambers digitized for domes and reverse dome machining. I don't a job number, I would contact BarryR as he is just down the street from them and has worked with Diamond on the mapping of FE chambers.
This piston is a 4.270 bore but for the 428 "style" Edelbrock chamber. The domes are a custom add on to the "shelf" price but cheap, something like 10 bucks extra per piston.
Diamond has more bore diameters and pin heights for FE than any other manufacturer. For your 428 they have 4.155 4.165 4.175 4.185 bores with pins heights for 3.78 3.98 4.125 4.250 strokes available in every bore. Same with 390 and 427 diameter bores.
68 Cougar XR7 street and strip car, 428 4-speed, 3560# of fun, new best 10.43@131.2 1.47 60 ft
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