Some came with minimal generation head P8R which had 33mm consumption valves (Usually located on VTEC B-series) vs 31mm intake (non VTEC B series), and The top experienced an 84mm shrouding vs 81mm for all other B series heads. Even crazier is this engine however has massive tuning potential, that https://cesarrkbti.dm-blog.com/39981039/b-series-honda-fundamentals-explained