Some came with restricted manufacturing head P8R which had 33mm consumption valves (Typically identified on VTEC B-series) vs 31mm intake (non VTEC B series), and The pinnacle experienced an 84mm shrouding vs 81mm for all other B series heads. Identification: (ninety eight spec) PR3 stamp on engine head, prime radiator https://b16b-type-r81234.digiblogbox.com/64165366/the-basic-principles-of-b16-engine-for-sale