340 help

Demonic said

I just looked at my 71 340 block, nothing like that, completely smooth. The gasket covers it, likely nothing to worry about.

Click to expand...

If you look at the 318 poly block you will see 2 of those ports on each side.

To use wedge heads on these old 318 blocks you have to plug these holes.

You could build a 340 poly out of this block. How kool would that be?

Of course the early 318 block are so thick walled they can be bored to 340 size anyway.