Type R or not a Type R

Was up I need some help. I just bought a b16 motor and it soupposedly has a type R head on it. How do I find out if there is any truth in this? A friend of mine told me there is no codes and the only way to find out it to take the cams out and measure them. Is this right? If so what are the measurments? Thanks

 

If it is a type r head it should have PR3-x (x=1-4) stamped into it.

 

So do B16A heads

There should be a mark of green paint by the distributor, dual intake and exhaust springs. Also you could measure the cams.