This is what I found today when I took off one of the heads. I don't even want to take the other one off. #4 and #6 had 0 compression that's what led to taking it apart to find this. The head is definately toast. There is a nice crack between 4 and 6. If it is salvagable then I will be in the market for some good aluminum heads. Chime in and let me know. Thanks.