I like it but you are stuck to using there head package as well. I just looked at the dart block on jegs and I think it was 3900 and I am betting you can get just about 500 cubes from it. I will ask my son tonight as he is playing around with a dart block at work for a customer. I will ask what he is doing to the block. Dart 31612211: ENGINE BLOCK HEMI 6.1L - JEGS High Performance
