Some arrived with confined production head P8R which had 33mm ingestion valves (Generally observed on VTEC B-series) vs 31mm consumption (non VTEC B series), and The pinnacle had an 84mm shrouding vs 81mm for all other B series heads. Even crazier is that this engine even now has substantial tuning https://zanecskzq.losblogos.com/38645915/helping-the-others-realize-the-advantages-of-honda-b16b