"Of the many B20 powered vehicles, three of them came with the P8R head, and only in certain model years. The Orthia, which came out in 1996 was one. The other was the Step Wagon. The orthia came with the P8R head in it's 96-98 model years and the step wagon came with the P8R equipped B20B in it's 96-98 model years. The CRV also came with either the P8R head or P75 head in it's 96-98 model years. The P8R head is a completely different casting than P75 heads which were used on all other B20's. This head came with 84mm combustion chambers and 33mm vtec sized intake valves."

More info specificially about this head if you/anyone else doesn't believe me:

http://www.honda-tech.com/showthread.php?t=1467903