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Tuning a Holley or Holley-style carb?
You need power valves.
This 10-pack from Quick Fuel gives you a range of common sizes: 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5, and 10.5.

Now you'll have the right valve on hand for tuning changes or if you blow one out.

They come with Viton gaskets for a good seal.

These work in Holley, Quick Fuel, AED, and Barry Grant carburetors.
Part number 2240-10.

If you're serious about getting your carburetor dialed in, having a selection of power valves is a must.
60-day warranty included., keywords: Holley power valve kit | 10 pack 2.5-10.5 Quick Fuel 2240-10, Viton gasket carburetor valves, AED Barry Grant compatible4.5 out of 5