That's a wear groove, for sure. On your pic of the sleeve, notice that slight groove near the flanged end? That's so you can break the flange off after installation.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
