It occured to me that when adding the cost of racing rods and flywheels to ungoverned 212 predators that we are matching or exceeding the costs of the larger engines run as stock. The larger engines are probably going to still produce more HP and the cost in labor for custom fabrication of mounting and throttle and exhaust assemblies for the big motors might be similar to the disassembly and reassembly of the predator 212s when installing the rods and flywheels.... ( and maybe valve train mods etc etc ) So what is the downside... I believe the 301 and 420 motors weigh about 35 pounds more and will require heavier Torque Converter of Clutch in case the extra weight bothers anyone. Of course to match performance with the modded hi revving 212s the sprockets and gearing ratios will have to be changed.