To my knowledge, The tensioner on the double roller sets only covers the first row of links, not both (the tensioner is the same size as the factory 6.1 piece). To me that is somewhat of a disadvantage. If someone made a beefier tensioner that was large enough for both links to ride on I would be interested. Until then I like the factory tried and true. Not to mention most of the fast modern Hemi guys run factory timing set.

Someone correct me if I am wrong on the tensioner being the same between single and double rollers please