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I thought better for pistons reflects internal design (which is often reflected in how light you can go for a specific application), quality control (both in material and manufacture), and design features (around ring sealing and pin oiling, sometimes around crank clearance or compression height).
Generally, I thought Wiesco, CP, and J&E were the top draw in the US, with Diamond, Ross, J&E's SRP line a step behind, and a few $$ less.
These are not inexpensive pistons. Would they be better than pistons from the piston manufacturers? Or are they a private label from one of the manufacturers?
A custom LS7 piston could be easily ordered as a custom, with compression height and valve pockets specific for the desired application.
Coatings could be applied to any piston. By doing the coatings separately, you can control what you are using. And if coating, you can also add related components (valves, combustion chambers, etc.).
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