originally it was because it was running very poorly, no power and blowing air out the intake. the original owner thought it was a burnt valve. i pulled the driver side head off and it had a 1" hole in the head gasket between #4 and #6 cylinders. i pulled the other head and had them checked out. they both had cracks so i got them replaced and now im trying to make it work again. hopefully i will be able to get the intake off and fix it within a few days i had planned on driving it next wekend