Phrasal Verb: hop up Slang To increase the power or energy of: hop up a car. Just a few of our customer’s engines which have come to us for upgrades to increase power & performance. Dave's Engine French Ford Flathead 255 cu in Graham’s Engine 59a Ford Flathead 239 cu in Rob’s Engine 1949 1949 8BA Ford Flathead 259 cu in Chris Shier's Engine 1949 8BA Ford Flathead 259 cu in Andy's Engine Lycoming Flathead 288 cu in Bob’s Engine French Ford Flathead 255 cu in
