I swapped them out (and installed a ground kit) and after about 3 months I found them super loose (could turn by hand). Installed the original bolts back and so far so good. I think because of heat cycles the hole expands/contracts and caused the studs to become loose. The original bolts are not completely round so maybe they stay in better?Got some studs to replace the ignition coil bolts and some washers to go along with them.