Visually inspect the freeze plugs. Look for any cracks, holes, or other damage to the plugs. If you see any damage, the freeze plug should be replaced.
Feel the freeze plugs. If a freeze plug is loose or bulged, it should be replaced.
Listen for any unusual noises coming from the engine. A bad freeze plug can cause a ticking or knocking noise.
If you suspect that the freeze plugs on your 350 motor are bad, it is best to have them replaced as soon as possible. A bad freeze plug can lead to engine damage if it fails.
