Fact of the matter is. A roller lifter cannot "turn" unless the tie bar holding the adjacent lifters in proper orientation breaks or comes off. In order for that tie bar to come off the spring steel retainer or spider must come unbolted or one of the arms has to break off...
Since a sbc lifter has an oil groove all of the way around it there is no way for it to block oil to the bearings by rotating in the bore. The lifter galley is the first place to get oil in a sbc (yes even before the mains and rods). The oil passes through the lifter galley and is then distributed to the mains which then supplies the rods. Oil feeding the lifters is sent to the top end via the push rods. Thus as long as the pickup is taking in oil and the pump is putting it out and it's going through the filter the lifters will get oiled first. There are screw in plugs behind the flywheel flexplate in the block and press in plugs behind the timing chain with small holes in them. If one comes out it'll lose oil pressure. If you roll an engine over by hand a half dozen times you will begin to collapse hydraulic lifters.
If you wipe a camshaft lobe the fine particulates will wipe out the main and rod bearings and oil pressure will drop. Hence whenever an engine eats a camshaft or lifter you pretty much have to totally disassemble it, thoroughly clean all parts and oil passages and rebuild with new bearings. and in some cases have rods resized and the crank turned...
I've seen sbc roller camshafts eat themselves a few times. Easiest way to tell is to pop the intake, and remove the lifters that aren't opening the valve... you'll know right away if you have a bad lobe. I've also seen lifters that won't pump up...
A few years ago I had a customer bring a brand new Hi-perf marine engine to me that ate a roller camshaft... GM or Mercruiser had installed BBC roller lifters in the mouse which have flats 90 degrees to a sbc roller lifter... hence the roller was sliding over the lobe instead of rolling... engine lasted a total of about an hour before it died...
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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