Hi all,

The mains bearings on my 13/60 herald engine say .020 US on them. I assume this means they are to suit a crank reground .020? I am looking at bearings but they are listed as .020 oversize...

yup.crank is ground so journals are undersize

You need to measure both the crank and the bearing tunnel as both can be bored/ground to a different size

Thanks for the replies - here are the markings