Some came with confined output head P8R which had 33mm ingestion valves (Generally uncovered on VTEC B-series) vs 31mm ingestion (non VTEC B series), and the head had an 84mm shrouding vs 81mm for all other B series heads. We hope you observed responses to all your Honda B16 thoughts https://b-series-honda48035.blogthisbiz.com/47297385/5-simple-techniques-for-b16-crate-engine