[tcat446]

" Is it possible the sheaves on primary are to far apart (if that's a thing)? And the belt simply rides to low on the primary? "

Not possible and is not the problem. Likely the belt length. Measure around the belt with a tape, or mark the belt and work bench with a marker so both marks line up. Then roll the belt till the mark on the belt touches the table and mark the table at the belt mark. Measure the distance between the two marks. Should be 47 3/4" Plus or minus 3/16" per spec.

 

[tcat446]

It never hurts to clean the clutch faces with Brakleen in the red can. This will take off the rubber build up and allow it to grip better. Then rough up the gripping surface with maroon colored scotch brite.

 

[tcat446]

I am thinking that Dayco is meant for a 440 or something smaller not requiring alot of power to be applied to the belt. If you go to their web site it should list belt HP ratings.