a thin nut like that, use ignition wrenches, there thin.. some dollar stores also sell cheap wrenches made out of pressed steel ( like 10ga ) and there quite thin.. I used to have a set and they worked great for that but I'v since lost them somewhere
That nut is used in a new cam design for fastening the modular lobes and is in fact based on the Ambihelical Hexnut - used on the Low Lift Bounce Flow (LLBF) cam. This cam bounces the valve at low lift only and requires extensive modification to the lifter valley and valve train parts. One benefit of the LLBF is enhanced cylinder filling at low lift, simple enough. The cam is a modular design known as a Modular Mobius Grind (MMG) and is a nighmare to clearance for any application. Here is a 'lobe' for the MMG LLBF Cam...
If you could find an old Mobius flip-flop wrench on Ebay or somewhere, that might fit it.
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