I though of another possability, oil once got into the coolant system and there are still pockets of it trapped inside. Before you tear the heads off you might try flushing the system with a cleaner to break-down and remove any pockets of oil. If after that you still find oil in the coolant then the heads will have to come off. On the subject of the holes in the top of the motor, they aren't from cracks, when the distribution pipe leaks, or any of the hoses on top, the coolant sits in those recesses and ROTS the top of the motor. When working in that area a Shop Vac cleans it right out. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote: > Has been discussion about this in the past. General consensus then was > casting acts like a heat sink. Best solution was to keep the recesses > clean. Is no problem to spray water UNDER intake manifold every time