the 427 SOHC or "cammer" as it was often called was originally designed for use in NASCAR but it didnt fare to well so Ford decided to sell it to people for use in drag racing. it powered a few A/FX and B/FX cars, i cant remember the exact names but i know they were in a 65 mustang type funny car A/FX? racing series and a cougar type funny car in the B/FX? racing series. these engines would produce "625-650 hp" but we really know they under rated and its more like 800+