I was running my 70 455 442 down the highway at about 3300 RPM when the oil pressure dropped to about 0 and rapping started. No overheating occurred. I had it towed home and started it. It rapped at start but stopped as pressure was back at 50 psi. After a bit I could hear it starting slightly again getting worse as time went on. Is a bearing spun? Can I replace them from under the car by removing the oil pan?
