Do the job once and do it right. Here is a complete timing chain gear kit, it comes with the Crankshaft Gear, Camshaft Gear, Dual Row timing chain and timing chain tensioner. The Triumph TR3 to TR4A motor had very long lasting steel gears which have a very long life. But a lot of these engines have are getting up there in miles. Put a new set of timing gears and chain on your Triumph and this will keep that camshaft timing spot on with no slop.