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This would be for an old engine I hope to transplant (temp) without any valve train or other non-PM work. Ideally I don’t even take the head off…No, they're fine on a (strong) stand ,( Dynamic loads of a cranking engine are different/greater from static load of a sitting engine,)
Verify and set valve clearance before either test though so you know a tight valve clearance isn't borking your tests.
Have the throttle body off or held open for the tests Too.