Without a heat source or ability to grab the head with vice grips, or an impact tool that Carl suggested, You could just drill the heads off the screws. Chose a bit just a little larger than the screw diameter, which should be about 3/16" (and smaller than the head), and go to town on them. If they're clutch head screws, that even helps as you don't need to center the drill bit.
You'll know when the job is done when the head of the screw starts spinning with the bit.
Even though the heads are rounded, I was able to grab them with vice grips. It takes a couple tries to develop flat spots on the sides of the heads so the pliers stay on.
Carl, the front emblems have captive nuts on them, held on by screws thru the back, so the nuts aren't accessible for heating or application of penetrating oil. But the heat works by heating the screws. The side emblems have studs on them with accessible nuts. That might be what you were thinking of.
Last edited by klhansen; 11/05/2018 2:18 AM.
