Cleaned up the 850dp for the stroker and one of the 450:s for the 273.
Guess which one.
Guess which one.
66 Dart GT HT Whatsitgonnabe?
- Thread starter 360DartGT66
- Start date
-
Today I welded what I thought were two cracks in a 440 block I sold a while back.
It turned out to be an old weld repair that had sort of come loose on one end. The other end was not really a crack, just a different material. There were some inclusions so I had to grind it down a bit.
I went and got some cast iron electrodes and practiced on a cracked head. Then I went to work. Built up patches and peened in between layers.
The top surface was tricky. It kept digging a crater so the weld crept closer and closer to the bore on one side. I finally managed to make it fuse with the top surface and after a rough grinding there is only a little porosity right next to the threads of the bolt hole.
I think that may disappear when the surface is decked once more. Whether the fix will hold remains to be seen. It’s my first time welding cast iron.
The reason I had to do this is that I sold the block and it was rough bored and decked before the machinist found the cracks. I ended up paying for the work so in order to salvage the block and still have a chance to make some money off it, I couldn’t have a professional do it.
If it holds, I’m good. If it cracks, I’m no worse off than I already was.
Anyway. We’ll see. I’m not sure if I should try drill and tap it standard size again or put in an insert.
It turned out to be an old weld repair that had sort of come loose on one end. The other end was not really a crack, just a different material. There were some inclusions so I had to grind it down a bit.
I went and got some cast iron electrodes and practiced on a cracked head. Then I went to work. Built up patches and peened in between layers.
The top surface was tricky. It kept digging a crater so the weld crept closer and closer to the bore on one side. I finally managed to make it fuse with the top surface and after a rough grinding there is only a little porosity right next to the threads of the bolt hole.
I think that may disappear when the surface is decked once more. Whether the fix will hold remains to be seen. It’s my first time welding cast iron.
The reason I had to do this is that I sold the block and it was rough bored and decked before the machinist found the cracks. I ended up paying for the work so in order to salvage the block and still have a chance to make some money off it, I couldn’t have a professional do it.
If it holds, I’m good. If it cracks, I’m no worse off than I already was.
Anyway. We’ll see. I’m not sure if I should try drill and tap it standard size again or put in an insert.
Last edited:
-
