Are 340’s rare

Yeah, you are 100 percent right, the 340s are a whole . 049 inch larger bore then 318s. Not remotely true, yep, thanks for that correction, your the man.

View attachment 1716228870

Yeah, you are 100 percent right, the 340s are a whole . 049 inch larger bore then 318s. Not remotely true, yep, thanks for that correction, your the man.

View attachment 1716228870

It’s more like 130. It’s a ton, otherwise I wouldn’t have pointed it out to you.
I had a virgin X block bored from its virgin 318 size bore out to 4.07 to go to 416 cubes. You wouldn’t believe how much weight that removed from the block. A ton of iron.