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It could be any of the following:

* A sticking or burned valve, * A damaged head gasket * A damaged or worn piston If it's a damaged or worn piston there should be quite a bit of "blowby", meaning that there will be pressure inside the crankcase when the engine is running.

If the head gasket is damaged there should be a leak into the crankcase (blowby again, or a leak into the water jacket, in which case you won't be able to keep coolant in the radiator.

If it's a sticking valve or just about anything else that causes poor compression, you can perform a "leak-down" test to find out where the compression is leaking. Since you know it's the #5 cylinder, perform the leak down test on that cylinder and see where it's leaking... then you'll know.

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15y ago
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Q: Why no compression on cylinder 5 on 350 small block?
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