I use from .055 to .080 from coil bind at room temps, more (.080) on aluminum heads as they get taller when warmed up making the installed height get a little shorter, moving the spring seats closer to the retainers
By the way, I check the pressures on every valve and set the installed heights based off of the coil bind clearances, not off the advertised installed heights
Sometimes I need to change the inners or dampeners around to get the pressures closer together also