You guys made that easy...I thought the hardest to ID would be the gold Testors head for Cox engines followed by the late model Hornet head made by Dynamic.
Top row L-R: Atwood Shriek, Fox, Holland Hornet, K&B/Aurora Tornado & Cox standard.
Bottom row L-R: Holland (Dynamic) Hornet, Cub, Cox high comp., Testors (for Cox) and Wen-Mac/Testors.
I totally forgot to add the Gilbert .07 glowhead!
Mark