"Power" valves vs. "Spark" valves

[flatheadmurre]

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My guess would be that the upper row is spark valves and the lower row is power valves from the springs position...agree with Sal on that the "look" of nr8 is spark valve but the spring position says power valve.
Basicly if you suck from the mushroom side and the valve moves it´s a power valve.
Spark valve moves the opposite way.