340 stock valve springs

I think that the .410 lift of the 340 cam is a bit understated. I run a 71 340 Demon in the NHRA stock eliminator and they list the specs for cam lift from what was given to them by Chrysler. That lift is .468/.472. The actual factory cams were more in the .450 range so there would be a little bit more difference than the 318 cam at .390 lift. But that's just from my experience with the NHRA stocker 340s.

Ken