Streetmaster to Airgap

First of all, Stocker's get most of the ET in the 60 ft. Start with 4.88's and a 5400 stall. 2nd of all, they use about 320 duration to keep the rpm's high. Many will spend a few grand on getting the "most" from what may be a bad head from the factory. All the rest of the HP is hunt and peck