Underdrive Pulley Question.....

[captahab]

I was wondering is there any way I can visually tell if my car has underdrive pulleys installed ? All these pulleys look alike to me.

Thanks.....

 

[faststang90]

most of the underdrive pulleys i remember installing i had to use allen headed bolts to install them. if u have normal bolts in the balancer then its a stock one.