Underdrive pulleys

[jam019]

Question , On the underdrive pulley set, that being the Alt. and Crank pulley set, is the Alt. pulley smaller or larger than stock.

I know that the Crank pulley is smaller than stock ,but wasnt sure about the Alt. one.

 

[86-ZZ3]

At least for the March pulleys that I bought years ago, the alternator pulley is bigger (to turn it slower and use the same belt) than the OEM one.

 

[WhalePirot]

consider

I did this on a Suburban and will not do it again due to charging issues and harder steering effort while parking, for minimal power gain.

There was a thread debating this some time ago. As usual, my opinion was in the minority, but I hate spending bucks for little/no gain. Done enough of that.