whats the b16 head difference????

[majormaster01]

I was just curious if anyone could tell me the difference in the 3 b16 vtec heads????(pr3-1,pr3-2,pr3-3) I was just wondering if there is any difference??? any comments are appreciated!!! thank you

 

[saturn_boy96]

just obd's.

i think its

pr3-1 = obd0
pr3-2= obd1
pr3-3= obd3