isn't the big core plug in the back of the block supposed to control the rearward travel of the cam?
over the years, GM built millions of V8 (and V6 and I4 and I6) engines over the years that didn't have any sort of thrust bearing or bushing behind the cam gear.
i know you need something on the front of the cam to control forward motion with a roller, but why would you need to control rearward motion like that? flat tappet cams push the cam backwards without bearings or washers in there, and they can go for 200,000 miles without any problems.
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