What is meant by….Trick ring face

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Piston Ring Back Cut

This terminology is used to describe a compression ring with less than SAE standard D-Wall radial thickness. The radial thickness is defined as the ring’s inside diameter compared to the outside diameter. Back-cutting reduces natural radial ring tension by increasing the inside diameter. In applications where there is a tight top ring land-to-piston clearance problem, back cut rings allow them to be moved up toward the top of the piston, which improves combustion efficiency and provides more power.
 
I'll try to get some decent pics as well as an explanation of the ringlands and rings used in some of my stock eliminator pistons in a few days.
 
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