not everyone lol had a friend who didn't and tried to put it in and torqued it down and it was tooo long split the head went to replacing a thermostat housing to replacing his HEAD lol. the holes for the valve cover are just deep enough for a certain length bolt there isn't much extra length to work with. That's naturally pure allunimum not steel like the block so that will split like nothing OR at the very least the threads coming out like filings and wish got the OEM bolt. I still remember that guy a .50 cent bolt turned into a $1,000 head replacement.