Some arrived with limited output head P8R which experienced 33mm ingestion valves (Usually discovered on VTEC B-series) vs 31mm intake (non VTEC B series), and The top had an 84mm shrouding vs 81mm for all other B series heads. The B16B is like a shorter stroke equal with the B18 https://jdm-honda-engine57891.loginblogin.com/47869948/top-guidelines-of-jdm-honda-engine