If the intake is aluminum your antifreeze ate a hole in it.The same thing happened to me on my wifes van ,I was able to fix the hole with JBweld and 3 years later still no problems ... Good luck.
Essentially, poor design. Gm's 3.1 and 3.8 motors are notorius for them failing. Even the Lincoln 4.6 falls into the same category.
The leak would vary on the size of the hole or seal failure.
Remove the intake manifold and take it to a welding shop that works with aluminum. Let them determine if it can be saved or not.
A hole.
There is a tapped hole next to the distributor hole in the intake manifold.
On a small block Chevy the distributor goes through a hole in the intake manifold. On a Pontiac the distributor goes behind the intake manifold.
the pcv valve is located at the gack of the intake manifold there should be a gromet at the back or a big hole if theres a big hole you also need the gromet and it connects to the carb and air cleaner. I hope this was helpful It's in-line in the hose on the back of the intake manifold.
A hole in piston is caused by extreme heat! most likely cause is coolant being introduced into the cylinder during combustion from a leaking head gasket,faulty intake manifold gasket or a defective cylinder head!
The intake manifold are very bad about corroding a hole in them which means that you will have to replace it.
It blew a hole in the intake manifold? You probably broke a pushrod. Get this engine to a mechanic or engine rebuilder.
I had a hole small hole in one of the manifold covers on my truck, noticed it after I saw lots of steam coming out of it, so I used heat tape( got from Checker Auto Parts) to cover it, and to date it's still holding. (mind you this is only a temporary fix)
Start with removing the intake manifold. If it still not found you will have to drop the oil pan. If it made it's way to the bottom of the oil pan it would be harmless, but you will not know.
check the rubber tube next to the the lower intake manifold gasket, there is probably a hole on the underside of the tube coming directly off the engine. (it is a manufacturer defect)