As far as we know over on the Rl boards, jsut to show what it could do. If we could get another 653 RPMs outta the engine like they did, you see what we could achieve. Thus the reason for needed aftermarket support.
The only mods were intake, exhaust, pulley, and the all important one, RAISING THE REV LIMITER!! Here's the link to the spec photo. It's a photogalley, so search it to see other pics of the Cobalt SS 272.