Size of a part not changing?

When I try to change the size of a part it won't change, even with Vector3. Here's the code:

local part = script.Parent

if true then
	part.Size = Vector3.new(part.Size.X(9),part.size.Y(1),part.size.Z(1))
end

Howdy!

That's not really how to set a Vector3 value. According to the Roblox Documentation on Vector3 Values, all you need to define is the X, Y, and Z value to set it to. You don't need to set where it goes to, as it is predefined by a format.

For example, if you wanted to change the size of a part in the workspace, you would use what I have below.

local part = workspace.Part
part.Size = Vector3.new(5, 20, 100)

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##Be sure to check out the Roblox API Documentation as well for additional reference.