who runs a short belt at the track?

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On my car I use a 5060885 Dayco (6PK2250 old #) belt bypasses the P/S and smog uses AC pulley but this is just an idler as long as AC in not on (no drag). Good for 3 MPH at the top end no noticable difference in ET due to no traction
 
I run only the crank, water pump and alternator, but I do have the tensioner flipped and placed where the A/C used to go. I use a 5060590 from Dayco or a 5060592 in the Gatorback. This is all with BBK pullies... don't know if it helps anyone, but I'll put it out there. :)