ProComp/Speedmaster aluminum heads

j par said

Remember a discussion about not being able to use my valves from my cast iron heads, but wondering now if I can just swap my Springs over? I guess I'm not sure if the retainers and such would fit? Or would I just use the spring itself with the same retainer?

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Not likely. If your SM heads have an installed height of 1.900 and your stock heads may be (as in might be) 1.800 you have too little seat pressure and not enough over the nose. I suspect you probably only have a 1.750 installed height on your heads now, so they are even shorter.