Break in oils, zinc and all that jazz

OHC has less valve train mass typically. Small engines and small valve train components with modern materials have less valve train mass. Combined they need less valve spring pressure. Even with slider cam followers or direct lifter to cam contact, they have less pressure at the nose. Probably means less need for zinc or similar high pressure additives, even with out rollers.++

Joe Gibbs has HR which is a line of oil for hot rods. That Amsoil Z-rod looks promising too. Redline claims that all their oils are chocked full of high pressure additives.

Valvebounce said

I know this is a bit off topic (of mopars) but how do these engines get of with cam break in, when you almost need to remove the head to remove/refit the inner valvesprings? And some of those motors pull to 7-8k standard. So the valve spring pressures can't be that weak?

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