L 134 Block

  I’ve been told by multiple sources that that crack can be repaired. One of the methods is Lock-n-Stitch. I am preparing to attempt such a repair on a block as we speak. If you find another block, don’t throw yours away. Yet. 

BW 

The motor had just one crack about 3" long that I had done the JB weld trick with Stop Leak added. It was holding pretty well (seeping at times). Because I'm doing a complete frame off rebuild I just had to mess with the cracked area to see how it was doing. (was not intending to rebuild the great running motor). To my dismay there were now cracks above and below the existing and one perpendicular connecting the two. Think of an "H"  The area was also bulging out a bit so I imagine it might have frozen somewhere in the past before it was kept in my heated garage all the time. 

My wife and I are planning a 800 mile off highway adventure across WY this summer so I want to make sure everything will be trouble free as I can. 

I had a MB block with a thin casting at the base blow open a hole inside and out while blasting the block. I ground it back to thicker material and fished a patch inside behind the holes, inside and out. Held them tight and mig welded them shut 1/4 inch at a time. You keep it cool. If it re-cracks, do it over. I then ground the welds flat and smeared JB weld over the repairs, inside and out. They haven't ever leaked in 19 years. That engine is still standard. 

I've discovered that if the oil float on your pickup is squashed down, that engine had water in it that froze. LOL! I found it again on another engine that was terrible. 

Good luck with your repair. Blocks are very tough to find now that are worth fixing. If it's out of a Jeep, it's out for a reason. If a guy is just changing to another type of engine and his old Lhead is a runner, they don't last long. 

PM sent

Mike