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Neil Harvey Neil Harvey is offline
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Join Date: May 2004
Posts: 73
We have never seen rod bearings for these engines in undersize sizes for the crank. When they were easy to obtain, we could mix and match uppers and lowers to get clearances where we wanted them, but over the past years you are lucky to get what they give you. The only way added clearance was ever possible was to reduced the journal size.

Running large clearances requires you to control the oil volume and pressure at the bearing. Oil grade certainly plays a role here as does the oil temperature. Unless you are trying to win a race against a fierce rival, use common sense and use typical clearances you would with a steel rod. The bearing shells will dictate what you can run and the only other way is the journal. Easy to add but dollars to tighten.
Old 09-02-2017, 07:39 PM
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