Does the infantry classes have different amounts of Shield/Health or do all classes have 500/500? If there is a difference; does anyone have the numbers on how much each class have?
No, HAs have the same as the other classes, it's just that they have their ability shield too, not sure how much health the shield gives though, or how much resistance the Resist shield gives.
So the only consensus so far is that Infiltrators have 100 less of something and that Engi/Medic/LA has 500 Shield and Health?