If you are talking about a 5.4L, one head gasket is about $1,300-$1,500 (Ford). If it's both then $2,000-$2,200 max. I just replaced both heads on a 5.4L. My cost for new heads, gaskets, timing chain set, spark plug, head bolts, oil and filter was under $1,500. Might want to look into replacing the heads while they are off to get the better spark plug threads. Just some food for thought. Without the heads you are looking about $500-$650. Hope this helps.