 The standard engine in the 400 was the more powerful Ford 289 'HiPo' Windsor engine producing 271 hp that was available in the Series 200 as an option.The 400 weighed a few more pounds than the 200 due mostly to the new Salisbury independent differential with a higher gear ratio giving it a higher top speed.Grantura Ltd of England designed the independent suspension for the TVR automobiles which later became the Griffith 200 and 400.