Re: 383 Oil Pressure Too High
Oil viscosity for your engine is determined by the tolerances at your main and rod bearings and also upon the smoothness of the finish of each. A polished finish can work well with tighter tolerances and a thinner oil will develop a good hydrodynamic wedge for the journals to ride on. As your tolerances get looser and the finish a bit more rough a heavier weight oil is necessary. A general rule of thumb for engine building is to allow .001 clearance for each inch diameter of journal.
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