Some arrived with constrained manufacturing head P8R which experienced 33mm ingestion valves (Ordinarily observed on VTEC B-series) vs 31mm intake (non VTEC B series), and the head had an 84mm shrouding vs 81mm for all other B series heads. The B16B, present in the enduring Honda Civic Type R, normally https://trentonjzpgw.blogzet.com/little-known-facts-about-jdm-honda-replacement-engine-54581853