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Stock 426 Hemi spec is .006"-.012". I assume your engine would want similar. If you are using wire keepers make sure you have the proper pins for that. That are different from all others. Instead of being flat on the ends the are chamfered. When the pin slides to one side the chamfer touches the wire and pushes it down against the groove instead of a flat end trying to push it out.

just hung up the phone and Mahle said .020 to .025 and did not have the pin expansion answer . But said all of their piston pin had wire locks and the clearance was .020 to .025 on all their applications . So I good with this piston and Mahle was very helpful in giving me information