b16a-1,2,3,4

[onecam12sec]

i was just curious and was wondering if anybody knows the differences between the b16a's head. i raced a car with a similar set up like mine, and he's running a 94' b16a with the code pr3-1. now i know it's a jdm head, but iwas wondering if it's a stock jdm b16 head or a jdm type-r.