Re: Tunnel sizes for '39 120 Main and Big-End Bearings?

Posted by DwainG On 2009/12/18 23:32:06

That information is in a shop specifications manual published by bearing manufacturers. Most auto machine shopss will have this book. Trouble is, if a certain manufacturer no longer makes bearings for a particular engine, they don't put the specs in their book either. By comparing three different books, I think I have pieced together the specs you want. Try main line (tunnel) bore 2.936", and Con Rod big end bore 2.220".