Timing chain tensioner

RustyRatRod said
I think you are right. It will keep the timing from jumping around from the chain floopin, but it will not keep the timing from retarding over time from the chain stretching.

toolmanmike said
X2 I put one on because I had one but really not necessary with a double roller set up.

So I've read all the responses only to confuse me more except one said not with a double roller ( that was my guess ) however I don't want the timing jumping around , preference is to be stable . My 340 doesn't have one that's why I wasn't sure