These adjusting rings are only suitable for high lift rocker arm sets in our range (see related parts tab) and are intended to adjust the lateral (axial) rocker arm play on the shaft and to ensure that the rocker arms are correctly positioned above the valve stems.
A number of adjusting rings are supplied with the sets, but it often happens that the number or thickness is not sufficient for a perfect adjustment.
It is then advisable to order a set of each type so that your work does not stop for lack of adjusting rings.
If your engine is already equipped with high lift rocker arms and you don't know which brand is fitted, the inside and outside diameter is mentioned in addition, check this before ordering.
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