I have had two mopar chain tensioners break on me, both times they broke at where the spring is attached to the tensioner. Second one broke off and started to wear a hole in the side of my billet aluminum timing chain cover. I will NEVER! use one again on a performance engine.

2000 Dakota R/T, 408 magnum, 727, Indy heads
1000cfm 4150 carb, 93 octane fuel.
motor; 10.258 @ 132.78
200 shot; 9.262 @ 144.69
racemagnum