the oil ring wipers are way down on the pistons, a long way away from the combustion chamber heat
I'm thinking around .030 to a max 0f .050 on them based on conversations I've had in the past with a NOS racer that went way fast with a big bore and short stroke motor bigger than yours is now.
I think he went 7.20 at 180+ MPH with NOS at 2900 lbs. on a legal outlaw 10.5 tire back then, 15+ yrs. ago