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With advances in automobile technology, higher quality and dramatically higher performance is required for most automobile components. Probe gas-nitrided steel piston rings have proven to be a high quality product, based on innovative technologies...in product, material and coatings.
Pre-Fit
Traditionally, pre-gapped replacement ring-sets are “sized” for the nominal bore size of the engine, usually with generous end gap clearances to minimize the potential of butting the end gaps. These are perfect of the novice engine builder or for a lower performance build where ring end gaps are not critical.
File Fit
The main advantage of a file fit piston ring is that it promotes a better combustion seal by setting exact tolerances, which helps to reduce blow-by and, more importantly, prevents the rings from butting up against one another and scoring the cylinder walls.