Biggest mistake ever- lunati cams

Regarding what will fit without additional machining, I fit these Comp single springs w/dampers to the Speedmaster heads using the retainers and spring locators that came with the heads.

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Only needed the correct sized shims to get the installed heights spot on. No milling or machining needed.
Had to measure what I had, determined what I needed and proceeded to check the specs of what was available to make it happen.

Single Outer Valve Springs: 1.476" O.D., 1.062" I.D.