Thanks for the info. I did a test fitment but didn't torque the blue adapter down too hard. The HF Oring was fine. So at first it seemed like a good idea, but then I remembered its HF and will be ordering Orings from MCMaster tonight. It's like $10 for 2x100 packs. I'll pay that rather then try to get them replaced with the engine in.
I would guess that they are torqued about 10-15 lbs. That's what they felt like coming off at least.
It also looks like the oring gets coned and fills the beveled edge on the adapter. So not too sure what having more material in there would do ...