Olds 307 and 403
- Oct 4, 2018
Well, good and bad. The main bearings look the same as when I popped them to add a rubber rear main seal, not terrible. I never popped the rod bearings but I assumed they were fine. I think they were fine but either the extra compression and or detonation killed them. Just over 9 to 1 compression 91 non ethanol gas. It only has a 20 degree vacuum can on it and I added a mechanical stop on the HEI mechanical advance. I will back that down 10 degrees. On fire up there was too much silver filings in the Lucas Hotrod 10W30. I assumed it was the used 204/214 cam heading south, nope. The rod bearings aren't spun on 1 and 2 but definite copper. Both rod and mains are standard but the mains were apart for sure. Clean out and new bearings with a new oil pump🤷♂️. In the new year, I will contact machine shop about the 358 in the new year, hopefully on their to do pile.