well this is something of an assumption but, since hypereutectic pistons sit much tighter in the cylinder and expand very little, chrome or iron rings may be more than enough with good tolerances.
like i said, call the piston manufacturer and ask them what they recommend. also call the ring manufacturer and ask them what material yours are.
like i said, call the piston manufacturer and ask them what they recommend. also call the ring manufacturer and ask them what material yours are.