Should I be using ZDDP Oil in my 327?

[Sheepdip]

Here is a Lucas Oil Zinc Chart. https://lucasoil.com/pdf/Zinc_Values_MotorcycleOil.pdf

What's interesting to me is their Hotrod and Classic Car Oil which I have seen at my local Speed/Performance Shop @ $5 qt +/- has a Zinc content of 2,100 ppm. Lucas Oils and additives are in use all over the mechanical world with great success, I'm also quite sure their engineers did not simply throw a dart at a chart to decide on the ZDDP ppm ratio.

I purchase any name brand oil of the correct viscosity, usually on sale, and always add 4 oz. of Lucas ZDDP for my satisfaction.

Witch Craft? Maybe ...but I run 2 flat tappet motors with zero issues.

[toolboxchev]

No, I have been using this for over 89k on a top end rebuild. It has the correct level of ZDDP and more importantly a higher film strength than most of the "hot rod" oils out there.

https://www.valvoline.com/our-produc...vr1-racing-oil

Read this for confirmation:

https://540ratblog.wordpress.com/