Crank Pulleys. Size?

[lancec2c30]

I had to replace my stock crank pulley because of the holes being ob-longed.

Chris sent me another one for free. , But as you can see here it is quite a bit smaller then what came off.

Now Is it okay to run an "under drive" pulley like this without replacing any of the other accessory pulleys?

 

[87GT Drop Top]

Yes it's fine. Ypu are better off leaving the other pulleys stock or even getting smaller ones to compensate for the smaller crank pulley slowing everything down. I ran into cooling and charging issues with the smaller crank pulley. Even with the 6G upgrade I was still not charging 14V. I got sick of messing around with it and put my stock crank pulley back on.

 

[faststang90]

i have ran that size on a street car no problems.