2x2’s again- power valve questions

[Ziggster]

From the pic, it seems the top two (5.5) still have the radius at the base of the stem. If so, the gasket will not seat properly, and it will leak fuel past the gasket and into the intake. The second row (4.5) seems to have that radius machined off which is what you need for the gasket to seal. The last two from Daytona parts also seem to have that radius present, but cannot say for sure on any of them as the pics are a bit blurry.