I suppose. I just consider .040 the last step before sleeving. Trying to keep it as original as possible. .030 gives me some breathing room. I don't care about the other 340 that I have. It's freshly bored to .040 with one sleeve. and that's probably the one going in. I'll keep the numbers engine as a museum piece. I'll leave it "worn out" and just store it on my run stand to fire up every 3 months or so to keep things clean and moving.