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There is 8 of them on the 350.
There are 2 in the back of the engine. You will need to remove the engine are the transmission to get to them.
There are 2 on each side of the engine, 1 on each side is hidden behind the motor mounts and 1 is behind the starter and the other 1 on the driver's side you can see.
There are 2 on the front of the engine just below the front of the heads. You will have to remove everything on the front of the engine to get to them.
It is a big job to replace the freeze out plugs.
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