Some came with constrained output head P8R which experienced 33mm ingestion valves (normally identified on VTEC B-series) vs 31mm intake (non VTEC B series), and the head experienced an 84mm shrouding vs 81mm for all other B series heads. Identification: (98 spec) PR3 stamp on engine head, leading radiator hose https://jdm-honda-b16b69134.life3dblog.com/38349572/top-latest-five-b16b-type-r-engine-for-sale-urban-news