With engine set to TDC, #1 is at TDC compression stroke while #6 is at TDC exaust stroke.
That means that #6 exaust valve should be open.Turn the camshaft and see if it closes.
If it does,and seats good,it's not bent.
I use elring head gaskets all the time and have never had a problem
Mercedes Benz Master Tech
ASE Master Technician
Owner of "Behind the Star Inc."