This custom mod allows the engine to build inertia unlike the 132ft Drag Mod. 150ft - 250ft Drag mods take up to 4X longer time to mod then any other modification. Timings are set both crank and crank case, Crank timing balance, Crank Lightening and line bored, Crank sculptured to accelerate to full speed within a seconds for full power. Some engines the crank cases are altered. I redirect the firing pattern to help push flame forward to prevent the loss of power due to flame resonating out the exhaust pipe and sculptured to build velocity quicker and maintain. Piston is lightened, Rod is lightened. So much going on to list.