In 1984, Porsche began using chain tensioners that rely on oil supplied by the engine's oil pump. These new tensioners do not fail like the older chain tensioners often do. The new kit can be bolted on older 911 engines, it's an update that should be made to any 911 (thru '83), or 930. Our original equipment kit includes all of the hardware and gaskets.
 
 Note: On Pre 1981 Cars Chain tensioners spacers are required, or you may update to the new chain wheel supports.