I just picked up a first Gen B16 from HMO and I swaped it into my Crx Si. I thought It was pinging so I retarded the timing all the way and added 93 Octane. I noticed Today it still made the noise with out the throttle so I think It could either be a valve adjustment or worn valve Guides.

It Starts at 2500 and continues, sounds exactly like detanotion. I say valve Guides cause when I had the header off I notice #2 valves had a small indention on the valves at the bottom of the guides and were shiny siler unilke all the others being dark black. I planning to do an adjustment asap

 

TTT for morning crew