Vintage Minor Register

The rear main size for the s.v. engine given in the morris register information manual is incorrect, should read 1 3/8" not 1 3/4".
Surprisingly enough this has been carried forward in each edition from 1965 onwards, not very observant are we?

Harry Edwards on page 91 of his Morris Minor manual got it right as MRJ13/8 but got it wrong on page 3 !