I started to tear down the non-matching number L48 that came out of my 69' Malibu. (HN coded block - B body with a TH350) I had been trying all different kinds of penetrates to try and free it up. But, no dice. I got the top end off today, very clean inside for an engine that won't turn over. Found a few valves in both heads stuck open. No major carnage so far. I plan to drain the oil and get a look at the bottom end soon.
If I could free it up, I would ring and bearing it - then slap it back together for a temporary engine.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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