Some came with limited production head P8R which experienced 33mm ingestion valves (Commonly observed on VTEC B-series) vs 31mm consumption (non VTEC B series), and The pinnacle experienced an 84mm shrouding vs 81mm for all other B series heads. Making use of the basic rules of the REV program, VTEC https://b16-crate-engine02356.life3dblog.com/38348711/about-b16b-type-r