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I have seen rod bearings pounded out from a mix-up of spark plug wires. It is possible to have one cyl running advanced and another running retarded. It may not be noticed by an amateur as the engine could still run fairly well… meaning it won’t backfire etc.
The advanced cyl will hammer out the bearing; the retarded cyl may seize the piston…
On the 351 this seems unlikely but it could be a 1-3 mix-up.
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