usually a blown head gasket will leak more compression than that
i would honestly do a leakdown test , or just put constant air on that cylinder and see if you get air coming up out of the cooling system

 

Or maybe it was tested incorrectly... but maybe is just barely leaking...

 

#1 is always the first to have problems in them so to me lower compression would almost be normal, thats the first cylinder to lose rods bearings, and always has the most worn out rings and piston.

 

Okay ... well the oil down the cylinder will tell you whats up

 

160 to 180 is not all that bad. Normal range is 10 percent. You are just over that. Oil test would be my first, leak down would be my second. Actually, a repeat regular compression test would be my #1. Remember to open the throttle body to get the best results.

 

just pour a damn cap of oil down the damned thing.... itll burn up anyways with no damage