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Engineers added the extra 4 degrees, just in case a mechanic needs to reach down, with his hand, between the heads and retrieve a bolt or nut.
Okay maybe not, but I encountered tightening nuts/bolts with such little space to turn a wrench, that I would have paid the design engineer for an extra 4 degrees of clearance.
Mercury has moved us into a rich mans sport. No more simple fun. Take it or leave it. Progress? I guess it is if you have the money.
That's so you can get your 10mm socket back!
...remember these?...:smiletest:...https://th.bing.com/th/id/R.7b5a2505...pid=ImgRaw&r=0