Part Numbers for Different Head Components



The PR3 Head stamped codes differences:

PR3-2 , PR3-3, and PR3-4 : 89-91 JDM B16A EF8/9, 96-00 OBD-2 Integra Type-R (JDM ,Euro, Asian, USDM)


PR3 - J00 or J51 : 92 JDM Integra B16A EF8/9


an ITR head is a ported B16A head from the factory. Both are coded as PR3 heads. So they are the same head but the ITR one (PR3-4) has had better intake valves, stiffer springs, bigger cams, bigger LMD's, bigger ports, steeper valve angles, some bowl blending work done from the factory.




Ways to identify an ITR/CTR head

* the green paint by the distributor
* thinner ITR intake valvestem (12% lighter vs GSR/Si valve)
* minor port work by the valve seat in the ports
* dual valve springs on both sides (b16a civic and b18c1 gsr heads have only single spring on exhaust side not dual), notice yellow paint on intake side, blue on exhaust side
* lost motion assembly has a blue dot