Some arrived with restricted manufacturing head P8R which had 33mm intake valves (normally found on VTEC B-series) vs 31mm consumption (non VTEC B series), and The top had an 84mm shrouding vs 81mm for all other B series heads. Identification: (ninety eight spec) PR3 stamp on engine head, prime radiator https://jdm-honda-replacement-eng72196.popup-blog.com/38582357/a-review-of-honda-b16b