MOJO, from what John posted earlier - left me with the impression that
the 510 and 514ci were just over-bored - stock stroke motors??
I'm without my Viper reference manuals right now, but isn't 4" the stock stroke? I know I had seen so much thrown around about the 510 and 514 being
a stroked motor, and for some reason I never put any thought into it, now
I have to re-evaluate my thinking.
If it's just a .030 over-bore - then only thing extra would be new pistons/rings plus the machine shop cost of the boring.