When I thread the bolts that hold the coil packs down, I can feel some of them not going down easily and getting hung up on the threads. Is there an alternative bolt that can be used or do I just keep using the OEM bolts knowing that helicoil is in my future?
It's M6x1.0 thread. You can get some bolts to hold down the coil, but you need an alternate grounding solution. Of if you can find some M6x1.0 double ended studs, you could put those in, and just use nuts to hold it down and the ground.