CNC-Motorsports offers the best in LS 415 cubic inch LS short blocks. Our short blocks are in high demand among racers of all types worldwide. We use the best name brands such as Dart, Callies, Lunati, CP-Carillo, JE, Diamond, and Total Seal just to name a few. All our short blocks are 100% machined, CNC Machined and blue-printed to our proven race wining specs. Custom builds available upon request..