Re: flathead oil
Keep in mind that the feds have required the zinc additives to be removed for emission requirements on the oils of today. I have been told that the changes in the diesel oils have also reduced it too. Make sure to consider adding a zinc additive to whatever you decide for continued cam and lifter life. Lucas, Hiltons and all of the major cam manufacturers offer it. I also have been told that the racing oils still have zinc in them , as they are intended for off road use.
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