Low oil pressure after a cam swap: the pickup-tube O-ring is the first suspect?
It's a reasonable first check if the pan and pickup came off. Speedway warns a pickup O-ring installed dry tends to tear and cause oil pressure problems. If the pickup was disturbed during the cam swap, inspect that O-ring and reinstall it well oiled.
Confidence: medium — sources disagree or are limited; check the sources below.
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Sources
- Speedway Tech Talk - LS Oil Pans — Speedway Motors