use an extractor to back the bolt out of the hole then replace with new one
There are valve cover bolts around the perimeter of the valve cover. You want these tight but not as tight as you can get them.
Check the specs for the vehicle you are working on (You can find them on the net if you do not have the manual) and the torque requirements will be there. Do not over torque the bolts as removing a broken valve cover bolt is a pain. Good luck.
Is your presta valve damaged and needs fixing or replacing?
Your head bolts are located under your valve cover. Take your valve cover off and you will see them. Hope this info. helped.
4x4
There are 4 bolts going through the center of the valve cover.
The valve cover on a 1996 Cadillac is held on by several bolts around the edge. After removing any hoses, fuel rail, or anything else in the way, remove the bolts to pull the valve cover off.
Remove each valve cover (four bolts.) Remove the gasket and set a new one in place. Set the valve cover in place and tighten the bolts to spec.
89inch pounds is the torque rating for the valve cover bolts
Loose, broken, or worn valve train component. Remove the valve cover to find the problem.
you just pull the three bolts holding the valve cover down. the bolts run right down the middle of the valve covers. pull the valve cover off, replace the old gasket with the new one and tighten the valve covers back on.
The valve cover bolts need to be torqued to 72 to 84 IN-LBS