New full set of HASTINGS piston rings.

Suit LS3 standard 4.065 Bore

A common practice in performance applications is file fitting piston end gaps to a precise end gap using slightly oversized rings. Most Performance Ring sets are available in file fit (+.005”) oversize. 

The end gap refers to the clearance between the two ends of the piston ring when installed into the cylinder bore. File fitting end gaps is best done with a professional ring grinding tool, however if filing by hand always file from the outside diameter towards the inside diameter to avoid chipping of the face coating.

It is recommended to file fit equal amounts from each side of the gap while keeping the gap ends square and parallel.

The recommended end gap is determined by the bore size and the application which the ring set will be utilized.

Below is a chart which contains the recommended end gap factor. To use this chart, multiply the bore size by the ring end gap factor to obtain the minimum end gap which should be achieved.

Example:
4.000” bore street engine with cast piston the top ring end gap factor is .004”, thus 4.000” x .004” = .016” minimum end gap.

It should be observed that for every .001” increase in bore diameter the ring end gap is
increased by .003”.

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