MODALBET And it had plenty of power even in initial 331-cid form. An early prototype recorded 352 bhp on the dynamometer after minor modifications to camshaft, carburetors, and exhaust. Drag racers would later extract up to 1000 bhp. But the Hemi was complex and costly to build, requiring twice as many rocker shafts, pushrods, and rockers; heads were heavy, too. All versions were thus phased out by 1959 in favor of more-conventional "wedge-head" V-8s.|Another Potential Danger is Electrical Fires