Vvt lock or not

74 DART' said

So did you keep the shim under the spring ? When you buy a replacement spring for a 5.7 they come with the metal shim. The new 68277306aa doesn’t. So that’s why I’m a little confused. I agree with the above post about always running the shim on an aluminum head

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I haven't installed mine yet. But the valve springs are the same as what comes in the P5160074 kit (for a bunch more) and the text there says no shims required. Works with the factory seats, retainers and locks.

P5160074 - Genuine Mopar Performance Valve Springs

Is there a seat under the spring to protect the aluminum head and that is being confused as a shim? I went and looked at my heads (2017 5.7 Ram) and there is definitely something between the head and the springs.