[a427sc]

Dave

The 12.19's will be plenty. I assume you are buying the complete hub/rotor assembly, and caliper mount to replace the GM setup that comes standard. Request a bolt on wheel hub, or specs on modifying your GM rotor/hub. This keeps the same wheel bolt pattern and backspacing. The only area of contention will be the caliper mounting as it relates to the inner shape of your wheel. I run a light weight steel circle track wheel with race tires. Lots of cooling and more space inside than the cast/forged wheels. You can move the caliper in (decrease diameter) a little and play with rotor mount spacing/caliper mounting to get enough room for a pretty big caliper. This allows you to keep the D's for the street, and use a cheap wheel set for the track. Don't forget the air cooling ducts, steel flex lines, Racing brake fluid such as Wilwood 550 (bleed often too), and race pads such as Performance Friction, Hawk or Porterfield. I find the PFC's work great, and don't wear the rotor like some others do. What about the rears?

McFEZ