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wesintl said:Loosing antifreeze and having milky oil cap could be a headgasket but I'd suspect it's a cracked head. Those dome piston heads from 79+ and 60 series don't have all that great a reputation. You'll have to have the head off anyway to replace the gasket but I'd start trying to round up a head if i were your. I'd forget all the testing and pull the thing your going to have to anyway. Or since you have a known 2f just swap it in.
Hope it's not and good luck.
RIDDLER said:Truck has only sat for about 20 days after the PO said it stopped.
FYI- The good engine is from a 1975 FJ40. is the head compatible to a 1979 block?