Are you looking for a qualified shop to repair or rebuild your Porsche vintage four cam engine? Drive on over to Speedsport Tuning in Danbury, CT where Jeff Adams and Matt Rosati head up the vintage department. Repair, restoration and maintenance of four cam cars and engines are our main business and focus. We can rebuild any kind of four cam engine, including the rebuild of the famously complicated Hirth roller bearing crankshafts.