hello I have a 2004 gmc Yukon with the famous head bolt crack how do I know which head bolts to use I don't want to remove the head yet till I get the bolts please help

 

You can use your VIN number to help you.

Or just buy both sets and return the ones you don't need. Most auto parts stores will carry both sets of new felpro head bolts.

Or pull a couple bolts and see what set you need.

 

Could you elaborate a little on this “famous head bolt crack” or are you referring to the casting marks under the valve covers?