I've searched for hours and tried some of the oreilly/autozone idlers (only 25mm wide) and can't find what i need. Looking for 70mm diameter (2.75") x 26mm width x 17 mm (bearing). I don't care if its aluminum or plastic.

 

Holy schnikees was that a hard find. After a million hours of searching, i FINALLY found it. Dayco 89052 or Autozone has 231042. Basically, 2000 BMW 740i idler pulley and its metal, $15. Just mocked it up and it looks good!! Can't fire it up til tomorrow. Lost a little bit of belt wrap, but i'm betting it wont slip.

Moral of the story- If you have Vortech V1 on your lt1 with 6" crank pulley and want a 2.5" blower pulley (found at aspracing for $65), you can get Gatorback 4080392 on amazon.com for $13shipped and you will need the pulley mentioned above because the normal belt is too long. Couldn't find the 4080400 and it might have worked, but not in stock anywhere. The 4080415 is way too big. The 4080407 is slightly too big, but might work with bigger crank pulley. Maybe if i go up to a 6.66 or 7" crank, it will be needed.

Now i need to setup a new tune because i'm estimating it should do 8lb on my stock 120k motor Time to switch to 2bar speed density.