What size belt to delete smog pump? and how do you route it?

[juiced_94gt]

Im going to fire up the 331 tomorrow but i need a serpt. belt, what size do i need to eliminate the smog pump?? and how do you route it?? any diagrams?? i heard a 89" belt will work but wont go on the idler pullie on top of the motor?? i would like to keep the pullie working if at all possible.

 

[The Green GT]

I have a diagram. Let me find it.

 

[The Green GT]

Here we go.

 

[juiced_94gt]

Hey man thanks alot.

 

[Dino Dino Bambino]

i heard a 89" belt will work but wont go on the idler pullie on top of the motor?? i would like to keep the pullie working if at all possible.

I installed a 6PK2300 (90.5") when I deleted the smog pump. Initially it was fine but once it stretched, it wouldn't maintain adequate tension and it would screech when I switched on the AC. A 90" belt should do the job.
My current belt is 87.2" (2215mm) 'cause I have an ASP 26% underdrive crank pulley.

 

[juiced_94gt]

Oh i have BBK underdrive pullies...does that make a diff?

 

[Dino Dino Bambino]

It might do. While the crank pulley is smaller than stock, the alternator/PS pump/water pump pulleys will be larger than stock.
I suggest you get a piece of string and route it where the belt will go to find out the required length. Remember that your belt will need to be maybe 1/2" shorter than your string so that it puts the tensioner pulley under tension. It might take some trial and error to find the correct belt length as I found out with mine.