[eedgell]

396 bored over .30 is 402. The 427 is basically a 454 block and a 396/402 crank. Having said that, The big 454 or bigger get milage enough because of the extra torque it doesnt struggle with the add ons like auto trans, power steering, a/c, ect.... Stroked small blocks dont get the mpg because there more than likely built up more than a more stock BB. Think of it this way, ponnies pulling your truck, or draft horses.