Some arrived with minimal generation head P8R which had 33mm intake valves (Usually discovered on VTEC B-series) vs 31mm intake (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 however has significant tuning possible, https://dallasdwphz.articlesblogger.com/62128253/the-definitive-guide-to-b16-crate-engine