there are many ways. . BHP is measured at the flywheel realistically, it can be measured at the wheels but is in-accurate.. . You can :. . modify engine management. . changing breather pipes, adjusting carbs - injectors, air flow intake management - exhaust mods, engine part weight loss...etc etc. this includes any form of alterations to computer management if it exists.... . You should look for a chevy owners club and seek the groups of people/websites thatshare this same interest.. . Be warned that modifying your car can be dangerous to the engines life time and your car could go bang the second you start it, hence get professional help and advice before you blow it up.