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The only place for a coil spring is up Zebedee's arse
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I've got a pair of rocker shafts from my spare engine which I'd like to disassemble and clean to go back on the heads before install them to the engine in the car.

Then I wondered, do these parts need to marry up with the original components? I don't have the pushrods from the spare engine, and the rocker shafts have been mixed up so aren't going back on the original heads either...

Assuming I can still use them, is there anything specific I need to check or measure to check for wear?

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Look at them for any wear or scoring where the rockers will sit and check there's no slack on the rockers themselves on the shaft. If there is no noticeable wear, they should be fine.

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I think these might be knackered 😂

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enter image description here

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Hmm, yes, not completely knackered but not brilliant.

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The shiny areas are heavily grooved and there are other deep gouges all over the shafts. I would guess there is 0.5mm of wear on those shiny areas. There is also ridges from where the pedestals sat.

From reading online it seems bits of debris from camshaft/lifter wear etc gets embedded in the soft aluminium of the rocker and eats thru the shaft. So reusing those rockers on new shafts is also a no-go.

Problem is it seems aftermarket rockers are also complete junk 🙁