i have an ap1, vortech supercharged. currently at 8.5psi on 4.5" pulley.

i want to install a 4" pulley. here is what i found in the FAQ:

the 4" pulley falls between these two belts. which one is better fit? please help me decide.

 

Get the 4060495 then if you decide to go smaller again it will work.

 

thanks for the reply Sideways.

previously i bought the old pulley from horsepowerfreaks. i cant find in their website a 4" pulley. i only found the 4.5 and the 3.8. do anyone know from where can i buy it online?

thanks,

 

http://www.aspracing.com/index.html

Just call them and tell them what you want.

 

thanks alot for your help. i'll contact them

 

Sidways, thanks again for the link.

i contacted them and they said they'd make one for me either in steel or alluminum. what do you recommend from your experience?

 

Aluminum.