Here is how to replace the front VTEC gasket on a 2008-2017 honda odyssey. This video will also apply to accords, pilots, etc that have the same assembly design.
Parts and tools listed below:
Gaskets 15845-R70-A01 (https://amzn.to/2rKF2tI) 15815-R70-A01 (https://amzn.to/2IRpH4a)
OEM spool/VTEC valve assembly: https://amzn.to/2TMCTdb (if you want to replace the old gaskets with OEM gaskets)
Pick tool set: https://amzn.to/2KNk59F
Angled pliers: https://amzn.to/2PhWHlD
Socket set: https://amzn.to/2PhYpDg
Ratchet and socket set: https://amzn.to/2PhYqHk