Some arrived with minimal generation head P8R which experienced 33mm consumption valves (Generally located on VTEC B-series) vs 31mm consumption (non VTEC B series), and The top had an 84mm shrouding vs 81mm for all other B series heads. The Honda B16 engine has cemented alone inside the JDM aftermarket https://b16engine24567.tblogz.com/considerations-to-know-about-b16b-motor-52960870