Trying to remove water pump, the rh bolt (facing the engine) that holds the timing marker, is apparently frozen.  I don't want to have it break in the timing cover casting so here are my thoughts since I cant reach the bolt threads to saturate it with penetrating oil.  Should I grind the bolt head off then have access to the remaining bolt shaft after I remove pump and spacer,  should I apply heat to the timing cover casting or should I drill a small hole into the timing case cover right at the bolt and saturate the bolt.....then use the breaker bar to get it loose? Any thoughts would help. Thanks, Charlie.