Mack,

Uh-oh - that's not good. Is the car still parked? Are you going to swap heads on it? BTW, it's very wise to stop driving the car when it begins to "burn" coolant. I have heard of more than one incident where the owner kept driving it, and when the head was finally removed, the block surface was steam damaged (pitted, corroded) from the leak, and required a new short block!! (Usually a used engine is installed, but you get the idea - the block was toast.) While this is not terribly common, it's something to keep in mind - when coolant is vanishing with NO signs of external leakage on a 603, it's time to park the car and yank the head.

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