well after reading the thread about the better belt wrap for the poor man i did some research and was going to do the same thing but when i got the pullys i didnt like how close the belt was to the edge...(im sure it would have worked but i didnt like it)..
I went searching for another method. I have a d1 with a 8 rib setup but i have the 6 rib standoffs that i spaced out. So i got to thinking i know that timing belt idler pulleys are wider and the way most of them bolt to the block are spaced with alot of backspacing and i figured if i flipped it around and spaced it right i could get it to work.
So i did just that, But after i got it spaced right so that it wasnt rubbing the j bracket, the j bracket was on a hard angle so i went to work with my bandsaw and measured and cut the ammount off i needed to and got the bracket straight. Everything worked out here is a few pics of my setup its basically the same thing that chevychad did but i changed my idler to a timing idler and cut down the standoff ond spaced stuff with washers to make it work.....
i know this is a little hard to read but i figured id make a thread on mine i did take it out for a drive last night and no belt slip at all and i gained 1-1.5 psi

 

looks good Corey

 

Looks good. How much room do you have for the tensioner adjustment? Looks to be awful close.

 

yeah its close but there is still some adjustment there if i could find the goodyear belt i need it would have more room for adjustment cuase the belt is shorter but that is a green stripe gates belt very heavy duty so im hoping it doesnt stretch much and i have the belt very tight right now

 

thanks man

 

part numbers and dimensions of spacers would be a lot of help if someone else were to want to do this

 

the only part number there is is the pulley which is napa part number t42031...and of course the belt which is 25-080427.....the rest of it was kinda measure and cut because if you have a 8 rib stand off it might be different since i had 6 rib i dont remember the exact length i would have to get that tonight when i get home but i use 2 thick 3/8 washers and 3 thin ones....once you get the standoff cut its just a matter of spacing the pulley away from the j bracket enough so it dont rub

 

What's the diameter of the pulley?

 

2.596 i believe is the diameter

 

Is the id on the bearing the same as ChevyChad's drawing? I'm having my standoff made tomorrow, I'm tired of waiting on Motovative.

 

no its completely different you dont just machine down the standoff in this one you actually cut it down in lenght.... like the 8 rib is 2.75 long and the 6 rib is 2.5 long i cut mine down even more than the 6 rib i forgot to measure it last night but its supposed to be a little warmer tonight ill try to get a measurement on it tonight....i have attached a few pics of the pulley i used so you can get an idea on what im talking about

 

Ahh, I think I see. The stand off just sits inside the pulley. The pulley is 64 bucks at my local Napa, not exactly cheap, but cheaper than Procharger's.

 

no its not cheap but i didnt want a cheap pulley cause that means the bearing is cheap and the stress and speed these spin i wanted a good bearing

 

Let me know when you get some measurements, I'm exploring other pulleys as well.

 

do yourself a favor a get a spring loaded belt tensioner installed

 

Most of us can't or don't want to spend $1K on a tensioner setup. This mod has been proven to work.