Thread: Freeze plugs are the stupidest thing ever invented

Originally Posted by DockShootinJack

I would say those plugged holes where meant more for pouring put the casting sands than for freeze protection

Correct. Casting holes to remove the casting sand. The misconception is that the freeze plugs are in place to keep the block from cracking when the coolant freezes. The heads usually crack before the block. Freeze plug contamination may be from an acidic condition in the coolant. If it were me, I'd replace all.

Originally Posted by Tracker123

Correct. Casting holes to remove the casting sand. The misconception is that the freeze plugs are in place to keep the block from cracking when the coolant freezes. The heads usually crack before the block. Freeze plug contamination may be from an acidic condition in the coolant. If it were me, I'd replace all.

Yep, gonna do that, replace all of them. I need to get a manifold gasket anywho.