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#1
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It may be that during extreme engine de-acceleration, such as a shift, that the cam may walk forward when using roller lifters, as the pump may be driving the cam during that very short period. I would think otherwise driving the oil pump would be enough to keep it in contact with the thrust face.
Paul
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#2
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With roller lifters you would expect to use a thrust plate of some sort ... TAZ
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#3
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The taper ground into the lobes is for lifter spin. I may have a secondary effect of pushing the cam back I don't know.
The reason I believe this is that every cam (flat tappet) Ive installed with a button never made any contact with the cover after disassembly many runs later. The clearance set was the gasket thickness. So I have assumed the cam was held rearward by pump load. Roller is another issue the plate is needed for insurance that the cam will not walk. Don't mean to be a PITA just info gathering. Also i have seen blocks run with high pressure pumps worn from the cam gear contact surface. Pumps put one hell of a load on the cam gear. You can feel it when pre-lubing. Also oil pumps are loaded weather spinning up or down in RPM.
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