Guys,

I just want to get some confirmation before I dive off and replace my head gaskets.

I noticed a coolant leak from the back side of the motor behind the intake. I can't get a real good look at exactly where the coolant is coming from but it appears to be streaming down the backside of the heads. It is clearly not coming from the heater core so my conjecture is that it is either a head gasket or freeze plug.

There is no water in the oil and I can't detect in oil in the coolant.

Is there a sensor or some other plumbing on the backside of the motor that I am unaware of?

The motor has about 150K on it so should I bother replacing the head gaskets or just get the motor rebuilt?