Engine case numbers B25

[Hardhatharry]

I have two sets of engine cases to use on my build. One case has some damage near the hole for the crank output which can be repaired with a DD101 number, the other case is good but has the number ED111, both are B25S.

I though all the B25s had a engine number starting with 101 not 111, is the 111 number a correct number?

The cases numbers have the right font and don't look to be tampered.

[Spaceman]

The engine numbers didn't all start with 101 - I have 2 x B25s from 1971 and 1972 that had engine numbers 2XXX and 8XXX. I assume the serial number began again at 101 at the start of each model year.

[Hardhatharry]

Cheers Spacey, I'll use the good cases