340 block / engine

The problem is that most of the 340 blocks out there are .040" or .060" overbored and not much meat left for another machine job...

FSM recommmends .040" max overbore, some people like to push to .060"... After that who knows if they will hold up...

Or your other option is to sleeve it....


But why do that when you can get a 360 much cheaper...