Jaron Olivecrona competes in a Nissan S14 with a 5.0 L V12 built by Hartley Engines. The V12 makes 700 horsepower at 9,500 rpm with a 13:1 compression ratio and E85 fuel. Although the engine is based on Toyota’s 1GZ-FE V12, it features many custom parts developed and built by Hartley Engines. Listen as Andre from High Performance Academy explains how they built the engine. View more photos of the engine here.