Infrequent oil changes or running with too low of oil level.
Running at consistantly too high or consistantly too low of RPMs
Running an extended period on an il-timed engine.
Timing chain jumped. An overheated condition can caused this.
An severely overheated condition can warp the block and cause this as well.
Water/fluid got in the intake
Yes the crankshaft for say a 350 4 bolt and a 350 2 bolt is the same the only dif is in the block itself. Just make sure to check bearings to make sure the cranks are the same for bearings and have not been turned that would be the only dif in crank shafts the size should be on the bearings std., .001, .010 .020 and so on
The first thing that I would check would be the Ignition Coil pack. Once they heat up they will stall the vehicle if they are faulty. Once the car cools off it will start again like there is no problem. If it was your crankshaft position sensor you wouldn`t get 4 blocks let alone 4 miles. Good luck!!
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