427 S.O. Overheating Questions

[cobred]

Here is a freebe to try. Drive it to get the engine to the too hot point and shut it off in the garage so you can work on it. Let it sit overnight. In the morning disable the ign. so it doesnt start and crank it over a dozen or so revolutions and then pull the plugs and see if any plugs are wet with coolant. Its worth a try.

[FOMOCONUT]

Are you getting any coolant pushed out the top of the radiator ? Jerry

[RICK LAKE]

Elmariachi Jim it sound like a leaking head gasket If the motor was overheated 1 time it is possible there is a spot for compression to leak into the coolant system. You don't always get alot of bubbles. This is the problem with aluminum heads and iron blocks.
The other thing is the water pump, Edel has 2 different ones. One is a high flow one that comes with a plate on the fins of the impeller inside the housing the other one doesn't. If you are careful, you can pull the back cover off the pump and see which one you have. DON'T rip the geasket.
I know there has been a couple of threads about AUX fans in the front of the radiator and how much flow they help or slow down. ERA sell there cars with a deflector and only 1 good fan. Alot of guys are having no problems with over heating.
The simplest thing to do is get a good pressure tester with a long hose and install it on the rad fill neck and go for a ride down the road. See how much pressure builds up in the system. This is an old trick that some guys used on there motors for racing. They know when the motor is about to toast with higher pressures. Simple and works if you have a base to start with. I think you have a pin hole and the motor seals it when cold and when hot cooks. A would also have the heads checked for straightness if you end up going my way. HEY just had a thought, Check the system out and put some DEX in the coolant system and see if the high temps stops???? Mom pasted last night, later. Rick L.

[elmariachi]

Originally Posted by cobred

In the morning disable the ign. so it doesnt start and crank it over a dozen or so revolutions and then pull the plugs and see if any plugs are wet with coolant. Its worth a try.

Car was at 210 when we shut it off last night. He just cranked it a dozen times, pulled all 8 plugs and no sign of moisture.

[patrickt]

If it was me, I would just jump to a head gasket replacement (both of them).

[elmariachi]

Originally Posted by patrickt

If it was me, I would just jump to a head gasket replacement (both of them).

We already knew that.

[patrickt]

Originally Posted by elmariachi

We already knew that.

Well, I thought about it last night. He obviously broke something else besides his bypass hose. I don't see how it would be his radiator, pump, or anything else since the pressure was immediately down and the fans were still blowing. I guess it could happen, but it seems unlikely. The only thing left are the gaskets and, in the worst case, warping the aluminum.

[elmariachi]

Originally Posted by patrickt

The only thing left are the gaskets and, in the worst case, warping the aluminum.

....which is why I came here to you experts before we started tearing into the engine.

[patrickt]

Pressurize the cooling system to about 12 lbs. then stick a rubber tube in each spark plug hole and the other end in your ear (and tell everyone to be quiet). If you get lucky, you'll hear something.