Originally Posted by CBear3

From my experience, here's what I've seen on carpet (on-road and oval)
Thats about a tenth and a half or two tenths difference a lap between them. When the regional guys put 13.5's in they closed that gap almost entirely. They'd still lose because they weren't as consistant, but it showed what a great lap on those motors were capable of. 13.5 is faster than 27T on carpet...hands down.