Pulley QUESTION

[89 ST4NG]

Is the stock alternator pulley the same size of the one that comes with underdrive pulleys?

I think they r but just wanna make sure

THANKS

 

[KamiKaziDK]

Don't quote me on this...but I think it depends on the kit a lot of times. I know my buddies was actually a different size so he has a low charge at idle in his 89, for us it's not as big of a deal cause are alternators are so much better