i tried to do a little research for you, and this is what i found:

PR3-X = B16A/ITR family cast
PR3-4 = B16A
PR3-3 = ITR

PR3 1989-1991 Integra XSi/RSi
PR3-J00 1992 Integra JDM B16A EF 8/9
PR3-J51 1992 Integra JDM B16A EF 8/9
PR4 1990-1993 Integra LS/GS
PR4 1996-1999 Integra LS/GS/RS (B18B)
i took a look at the thread you started with the problem you had, and i'm not really a "honda guy" but i figured i'd try to help (since it seems like the thread didn't get much attention).

is there SUPPOSED to be profile difference between the intake and exhaust cams for that head? i had an issue like that on a 240 motor i rebuilt. the exhaust cam had a higher lift than the intake. i crossed up the cams, and one side wouldn't spin. perhaps you either A) put the cams in backwards or B) purchased 2 of the same cams (either 2 intake, or 2 exhaust). in either case, with the motor all together and timed right, the extra tall cam (on the wrong side of course) is causing the valve to slap the piston.....just a thought