What can I use for a temporary replacement for a valve cover bolt?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! For a temporary valve cover bolt replacement, you could try a bolt of the same size and thread pattern from a hardware store, but make sure not to overtighten—it only needs enough pressure to keep the cover in place and stop oil spray. You might also try a bit of silicone sealant around the bolt hole, just for a temporary seal. Definitely swap it with the correct part as soon as you get it, though. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.