How to tell the difference?

[BoostedGT480]

I just bought a HD tensioner to replace my old tensioner. I thought I had the tensioner rated up to 500hp so I went to upgrade to the HD version which is supposed to be rated over 500+ hp.

I took a picture of the 2. Are they both the HD version? I can't find any model numbers on them to tell them apart

 

[thump_rrr]

Both Tensioners you have are the same they are both 500hp plus, for 500hp or less doe not have the stop on the outside,the stop on that one it's a screw on the base.
The difference between the tensioners is the contraction and the inside mechanisms The one is made with bushing and washers the other one is made with harden shafts and bearings.