When should you replace magnum valve springs?

[DumpsterFire]

Looking at a cam upgrade for my 5.9, at what point will the stock springs no longer cut it?

 

[RustyRatRod]

As soon as you buy another cam.

 

[DumpsterFire]

As soon as you buy another cam.

Figured

 

[NC Engine Builder]

The were designed for, and adequate for a stock cam, but after thousands of miles and heat cycles, I dont even reuse them on stock rebuilds.

 

[RAT ROD AL]

One day before they break !!!!!

 

[Oldmanmopar]

After the valves sink in the heads and lose seat pressure. Or the springs get hot from over heating the engine.

 

[HankRearden]

The biggest drawback of the magnum is the valvesprings.
The hughes kit was the best value I could find