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Man, you do a lot of work! Hats off from the other side of the pond.
Did you find out why the rebuilt 454 locked up?
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I have a large family and work two jobs (mechanic and fleet manager). Something always needs fixing and I see it as a way to gain experience and hone my skills.
I haven't done a deep inspection the 454. Initial inspection suggests that something went wrong with the piston or the rings in cylinder 5. I've attached pictures I took with my borescope. The engine oil smells horribly burnt, but doesn't seem to have any metal in it. 7 of the cylinders look fantastic. Cylinder 5 looks like the piston rubbed or the rings were too tight. I plan on doing a teardown/autopsy after I swap the motor.
What's weird is that the crosshatch is still visible in several areas. I don't know if it ingested water, got washed out from a stuck open injector, etc.