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Lifter bores should be lubricated with a very light machine oil, not a thick lubricant like assembly lubes. They may keep teh lifter from spinning as they should. yes use a good lube on the faces and cam but not on the sides.
wD40 is not meant to be a lubricant. It is a water/moisture displacer. I have seen nuts actually tighten up on the threads as they get warm when using WD40 as a pentrant.



I used the EOS on the lifters. its sort of a slightly thicker oil but not so thick.

I made sure that the lifters would turn in the bores without a hint of binding and that they woul slide into place with only gravity.

Then after priming the engine that EOS gets washed out a bit with engine oil but you get to keep all that wonderful zinc in the pan!