[cru_zn_29]

That's what happens when the oil never gets changed. I bought my first 1964 C10 in 1980 from the original owner with a rod knocking it looked just like that when I pulled apart. The owner said he had never changed the oil just added Raylube when it was low. Original oil filter ( AC) was plugged solid. Raylube was a reclaimed oil that cost 20 cents a quart.