order my plates! DECON

Still not understanding. You want to kill rats and mice? You are an exterminator?

RAT is slang for a Big block chevy motor.
MOUSE = sb chevy

Therefore the mighty Mopar wearing the D-CON plate will be hunting and killing RAT's/mice

From what I've read, the only thing Hemi's were scared of at the track were small block Chevies. Since people already called the Hemi's Elephants they started to call the small blocks Mouse Motors. Then naturally when the big block Chevy came out they started to call them Rat Motors.
This all started back in the 50's. The Mouse came out in 55 as a 265. The Rat came out in 65 as a 396.
Since then the displacement avalible in either motor has went through the roof.
Some people call the Big Block Chevy a Porcupine or Porcupine Head, because of the way the valves are splayed out on the head.

The Hemi was called an elephant engine due to it's size and power, it was based on the elephant afraid of just a small mouse and the term "mouse motor" was coined. Naturally the rat came since a rat is bigger than a mouse.