Each ring has gap, which serves two purposes - it enables you to take them out or put them back in their niches on the piston, as well as allowing you to measure how much worn they are.

3. After using the piston ring squaring tool, the ring gap measured 0.019-inch. That's a 0.005-inch difference, which in the world of high performance engine building, might as well be a mile.

The two most common places to use a set are when you’re setting valve lash or checking piston ring gap, two supremely important measurements related to the longevity of an engine.

But nowadays many racers, major performance ring manufacturers like Federal Mogul/Speed-Pro, and even the new car manufacturers recommend that the second ring should have a larger gap than the top ...

CHART While ring gaps vary from builder to builder. If you're unsure, you'll be happy to know that Total Seal includes a ring gap sheet that illustrates what gaps to use for a variety of engine ...

3. After using the piston ring squaring tool, the ring gap measured 0.019-inch. That’s a 0.005-inch difference, which in the world of high performance engine building, might as well be a mile.