Billet Aluminum Ultra Light Belt Tensioner Pulley
Just experimenting with a
Billet Aluminum High Speed bearing Belt Tensioner Pulley. You get a nice new Pulley Bearing and Pulley diameter is only
3/16 inch larger than stock otherwise Pulley dimensions are identical to stock.
The larger diameter will move the belt tensioner counterclockwise at the bearing center only 3/32 inch more which is insignificant 
To be installed and tested within a few days after I get Plenum back on my 90' (with some modifications to IH and Plenum of course
)
Belt Tensioner Billet Aluminum Ultra Light Pulley
See item #9c of Bling (Carter and Others)