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How many pounds of pressure should be in a 400 small block Chevy cylinder and how low can it go before it needs a rebuild?
Wiki User
∙ 9y ago
The compression readings will vary with wear from one engine to the next. What you want to see is that all the cylinder readings are within 10 to 15% between the highest and lowest. If one or more cylinders have a reading well below the average of the others, the engine is probably tired and in need of overhaul.
Wiki User
∙ 9y ago
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