[Alan Roehrich]

They seem to "like" about 0.004" to 0.006" on a 4.0" to 4.125" bore size.

The most important thing to know about those is the pin is not great, and the pin fit is too tight. Replace the pin if possible, and open the pin clearance up by about 0.0002 to 0.0005" from where it starts. Way too many of those things have seized a pin, with ugly results.