Here is a carbon apex seal from Mazdatrix
I don't see anything on the internet about the carbon seals requiring special break-in, but Mazdatrix claims only a 20,000 mile life.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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