Head Gasket 

The LeBaron overheated due to a clogged radiator, and started leaking exhaust into a coolant passage. From the moment it started running, exhaust would bubble out of the radiator overflow tank! Needless to say, this didn't help its cooling capacity, even with a new radiator.

Once the head bolts were out, I used ancient Egyptian technology to lift the head off the block.
Once the head bolts were out, I used ancient Egyptian technology to lift the head off the block. *
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Plenty of clearance, considering the exhaust is still attached.
Plenty of clearance, considering the exhaust is still attached. *
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The head gasket.  Nothing obvious other than the exhaust-tinted coolant passage outlines.
The head gasket. Nothing obvious other than the exhaust-tinted coolant passage outlines. *
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From the block-facing side, you can see where one of the coolant passages between the two middle cylinders has managed to blow through the gasket.
From the block-facing side, you can see where one of the coolant passages between the two middle cylinders has managed to blow through the gasket. *
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These tiny passages let just enough exhaust through to be a nuisance.
These tiny passages let just enough exhaust through to be a nuisance. *
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[Cylinder 1] Fortunately, the head and block surfaces were not damaged.
[Cylinder 1] Fortunately, the head and block surfaces were not damaged. *
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[Cylinder 2] Without removing the head completely, I couldn't tell if it was warped...
[Cylinder 2] Without removing the head completely, I couldn't tell if it was warped... *
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[Cylinder 3] ...but I decided to just replace the head gasket for now, and bite the bullet if the problem returned.
[Cylinder 3] ...but I decided to just replace the head gasket for now, and bite the bullet if the problem returned. *
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[Cylinder 4] So far, so good!
[Cylinder 4] So far, so good! *
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