If the junkyard is full of dirt-cheap ultra low mile engines . . and a top mechanic owed me a lifetime of low-cost, highest quality work . . then maybe.
I recommend pricing a new factory replacement engine. And a factory re-manufactured engine. And FSM hours for replacement. Add 10% to all.
Then figure how much you'll "save" by running dirt and metal through the motor you currently have.
Break even on my truck should be close to $20k. I might need to drive 300k to recoup my potential loss.
So long as one is comfortable with that kind of equation then have at it.
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