Hey everyone, I have been lurking around this site for a few months and I thought I would introduce myself and my car. My name is Dave and I have a 72 Red LS5, that has a mostly stock GM crate 454 Gen VI and I was wondering what kind RPM's are those with Big Blocks maxing out at? I have MSD ignition box 6AL and a MSD dist. my box pill is a 5600rpm and I am thinking about switching to a 6000. My car is a 4spd car with 308 gears in the rear end. Here is a pic, I hope this works.