With the support of Kas Kastner, A.R.E. is producing a full radiused velocity stack as developed by Kas in the 60s. This velocity stack was extensively developed and tested and produced by Dean Moon. The engine dynomometer testing yielded 4-6HP on four cylinder engines and up to an amazing 8HP on the GT6 engine. Uncle Jack's Racing Services and A.R.E. are now manufacturing this velocity stack, and distributing largely to vintage racers, but also to some street machines. The velocity stacks fit SU and Z-S carbureters. They also fit the Datsun version of the SU Carbureter. (In some cases modification is required for fitment)