mazdatweaker_2
+1y
Here is another question. When the truck blew the head gasket, did it involve the water jacket, and if so, which cylinder got the water in it?
Maybe that cylinder hydrolocked and if somone tried to keep running the truck it bent the rod enogh to where it didn't line up with the crank anymore.
The offset would lower the oil pressure at that rod and crank position enough to where failure would show up after awhile.
This is just a suggestion and would explain some things.