Coupled of questions: Are you going to have it honed with a torque plate? If no, then IMO you need the extra clearance to keep from scuffing the skirts when the cylinders get all out of shape when hot and under boost. If honing with plates, an honest .006" piston to wall is enough at the tightest spot. Check your Ross box or instructions for the "gauge point" they want you to use for your skirt measurements. Every piston manufacturer seems to have a preferred spot. It's often not at the very tip of the skirt. Good luck with your build.
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