if you can fit around the stock alt pully than do it =P

ss150 take look at summit raceing

 

Using the factory alt pulley with it will probably reduce belt length a good inch or so. You are only able to use your stock belt if you use all the pulleys, b/c the bigger alt and water pump pulleys make up for the smaller crank pulley size.

 

well sorry for posting this so late
ive been out playing

i got my pulleys in 2day,they are BBK billit aluminum and look great
came with alt,water pump and crank pullleys
i did have to go down a few sizes on my belt ,but i needed a new one anyways

they made a rather large difference on low end and accecleration, dead stop acc.
i pulled out from our local walmart and nearly lost it

in my opinion these were well worth the $138
being all u have to do is bolt them on and go

 

and find a belt that fits =P, did you use the alt pully?

 

Yeah did you use the alt or no? And let us know if mpg's change. And also can you confirm the part number? I know a guy that works at Oreilly and I might can get him to give me a discount.

 

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part number 1553
yes i used the alt pulley