Rebuilding low mileage barn find 350, low hours, clean internals, bearing damage.

[beastmazter]

Have an 86 suburban I picked up, non-running. 350 in it was toast. Picked up this supposed low mileage 350 that was in a barn and hasn’t run in 40ish years.

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Internals look really clean

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bearing damage found

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Need to get the tool to pull the harmonic balancer so I can get the crankshaft out to clean and inspect better. It looks suprisingly good compared to bearing damage. Noticeable scratch on the journal under the main bearing with the deep scratches seen in the photo above.

pistons in block are .040
Bearings are .010

Found small metal flakes in oil filter.

Is the wear pattern and damage consistent with dirty oil/metal in oil? Or assembly/misalignment issues?

 

[MarineOne]

This looks like an assembly issue. I'd bet the crank to bearing gap was slightly too large. The damage seen inline with rod is from rod hamming down on compression stroke and there being enough gap to allow oil forced out vs held in to lubricate / cushion.