Whats your twin charge idea? Blower to snail?
Yep polishing the rods gets rid of stress risers left from the forging process, the main thing is that large ridge left on the beam, that really needs to get blended out, most people leave the center section of the rod, but I have the tools to do it all so I will. And yes the rods need to be shot peened afterwards, I will do that later this week and maybe even cryo the rods. I will likely also resize them with ARP hardware and put new bushings in as well balance the rods. Remember that when you polish rods ALWAYS polish/sand with the length of the rod, never across, this will create different stress risers weakening the rod. You have be super careful polishing rods or you really will make them much worse than were originally. Its a job for steady hands and an ELECTRIC die grinder, if you have head porting tooling and experience you'll be fine, if not do your homework and practice on some scrap rods first.