Misalignment of the bearing shell and crank journal.004˝ in “old school” motors and race motors require thicker oils (20W-50 or 50W) to maintain the protective oil film between the bearings and their journals. Tighter bearing clearances require thinner oils while looser bearing clearances of. Fill the crankcase with a relatively thick racing oil and you’ll have problems right from the start. 002˝ usually require a thin multi-viscosity motor oil such as 5W-20. Late-model engines such as a Chevy LS or Ford modular V8 with tighter main and rod bearing clearances of. Bearing clearances too tight for the oil viscosity being used.This is especially important with cam bearings that can be easily misaligned. Bearings installed incorrectly (oil holes do not line up with the gallery holes).

Blocked or partially blocked oil gallery or oil filter.Oil pump cavitation and aeration at high RPM due to pump design, restrictions in the pump inlet tube or pickup, or oil sloshing away from the pickup in the bottom of the pan due to extreme cornering, acceleration or braking forces.Low oil level in the oil pan due to leaks, maintenance neglect or improper filling.Contributing factors that can cause oil pressure and lubrication problems in an engine include:

Ls1 cam bearings copper