stainless bolts

The thing with stainless, especially stainless on stainless is, if you dont get it started right or the two thread pitches aren't exactly a match it creates friction fast which makes heat. That kind of heat workhardens stainless and it will guald to itself making it completely unusable in less than one full revolution. Same thing happens when you try to use a standard tubing cutter on stainless brake line. Making it impossible to flare. IMO in an engine fastener application, you could get by with a light oil and caution on how you start the thread. Stay away from air tools! Don't forget a little anti-sieze on your spark plugs.