Yeah, those Allen head buggers.  Stuck good, not stripped out but no way any of them had the bite to turn them out.  Big pipe -  I got the top one with vice grips and hammer.  Bottom one, tapped a T40 Torx into the head and got it from underneath by the cat with a 15” breaker bar.  Halfway I thought.

Small pipe – got the bottom one like a regular person with a hex socket and breaker, not bad at all.  Top one, behind the pulley so you can’t get a socket on it, or the Torx.  I have a ground down Allen key, used an extension with a 6mm socket on the end that fits over the handle end of the Allen key to provide some leverage, but again no way is there enough bite to pop that screw, more force will just strip it out.  So I’ve been at the vice grips and hammer deal for about 200-300 taps.  Nothing.  PB and time outs, nothing.  Am I missing something?  Some other way to get at it?