In taking My B20z2 Head off a 00' CRV to send to a Machining shop for a burnt valve, Me and a friend came across Came across these after assembling everything back to Stock. We have looked everywhere; thought we had done a thorough job and these are the only 2 Bolts unaccounted for. The pictures Show an S engraved on the top; 14mm and as you see, there are scratches from contact on two places on the Bolt. Is anyone familiar with these? They are pretty bulky, and look important. Any input would be awesome