Sleeving pics. The compression/valve notch is still barely visible, did not quite take all of it. Note small black shadow right next to the sleeve.
The notch was recreated later in the CNC and all were deepened .050 for valve clearance.
Pic 1, just cleaned up the cylinder wall which made the crack really pop.
Pic 2, bored out to 4.375 to accept a 4-1/8 bore x 1/8 wall repair sleeve. This block was standard bore to start with. Note the step/ledge at the
bottom. Leave the step/ledge at the current bore until finish boring. The sleeve will set on the ledge preventing it from moving down. The
head keeps it from moving up. Notice it did not hit water at 4.375 bore!
Pic 3, Sleeve installed with .0025/.003 interference/press fit. When doing the finish bore of the cylinder the step at the bottom will be bored right
with the sleeve and will blend in making an almost invisible repair. In the lower left corner you can barley make out what is left of the
compression/valve notch. If you watch the video of boring this cylinder, right towards the end there is a close up and you can see the notch
that was recreated in the CNC.
This was done on Tooth's project "shop truck"!