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Can abad intake gasket in a Chevy truck 4.3 liter cause water the egine block?

Yes, a bad intake manifold gasket in a Chevy 4.3L (or any engine for that matter) can absolutely cause water to get into the engine block.

The intake manifold gasket sits between the intake manifold and the engine block. If it's damaged or deteriorated, it can allow coolant (water and antifreeze) to leak into the engine cylinders through the intake ports. This will contaminate the engine oil and can lead to serious engine damage.