Mercury Racing spent decades building engines for boats before it decided to sell one for cars. The SB4 7.0 starts life as a GM LS7 block and then gets something no factory small block ever had: dual overhead cams, 32 valves, an 11.7:1 compression ratio, and an 8,000 rpm ceiling, all rated at 750 horsepower on 91-octane pump gas. It ships turn-key for 32,995 dollars. Read on to find out what it actually takes to make a small block spin that high.