My old 76 shovels uses more oil than petrol so idevided it was time to give the top end a freshen up.

I took the front head off and it looked pretty sad and then when I took the barrel off I noticed the barrel has a gallery that lines up with a gallery in the head and the case has a similar hole.

What I noticed was the base gasket didnít have s corresponding hole in it.

Is this correct and if so why have the galleries at all.