hi
these are the std width p bearings .920" wide ! not marked upper or lower .
i think the naarrow ones are an h bearing .
just wanted to get the widest to carry the most load for longest life .
might have to trim side on cap half ?
even with narrow bearings i think the last stroker motor i did the halfs did not line up ? just did not stick out as they were narrower ?
The main reason to use the narrow bearings is the radius at the edges of the journals on the cranksahft. The radius is increased for strength on aftermarket crankshafts, if you use a standard width bearing, the radius will rub on the edge of the bearings, causing a reduction in rod side clearance, and rubbing metal off the edges of the bearings. As mentioned I think you are getting the upper and lower shells mixed up, not all brands are clearly marked.
