When to worry about engine noises?

QUINN FORBES said

Engine builders recommend using the rotella because it was higher in zinc but apparently they dont use as much zinc anymore. I cant confirm that as it is just what I have been told.
I used it a lot with no guff so far but Im trying the Lucas break in oil on the next build. Like honey! Often wonder about diesel oil being hard on the int shaft for dist and oil pump.

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Roller motors are not flat tappet so there is no need for zinc or zinc additives. A synthetic will work fine after break in.

You can get a piece of 1/2" wood dowel about 2 1/2 feet long, place one endo of the dowel on a valve cover bolt and the other end placed against a solid part of your ear, you will be able to hear many noises, this also works well on water pumps and other items that have rotational or metal to metal contact.

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