The one thing I do not like about the speedmaster cnc was they did not remove the guides before they cut them. The intake guides end up cut away in the port and are only about 1.5 inches long.The guides did seem to be better quality than some of the ones I have messed with for sbc, sbf. They are also a standard [easy to find] size, .545 OD. I replaced guides in a set of sbf ones that were a .507 OD rather than the standard .502
