Interesting AA head

[BruceUpstate NY]

This is on a '31 AA truck head with a 4 bolt pump. "B6050 5/30/32 SPEED HEAD"
Is this the "Police head?" Ratio?

 

[Fred]

The Police head I have ONLY has a "B" that is raised in the casting of it..

 

[Dennis Pereira]

This is on a '31 AA truck head with a 4 bolt pump. "B6050 5/30/32 SPEED HEAD"
Is this the "Police head?" Ratio?

I have a 6050 speed head out in the barn heart shaped chambers unknown ratio.