i bought a used 2000 lightning and the upper
pulley is different than the stock. how do i
know what size it is with the dia of pulley?
thanks, new to this board.

 

Put a tape measure across it and it should measure out to be about 3 1/4".

 

could you tell me the different size upper
pulleies and their dia? i bought the truck
from a dealership and they gave the name of the person who had it before me. but to no avail
i can't get a hold of this person. i blew the
number 2 plug and the dealership said it was
aftermarket upper pulley pushing to much boost.
they told me approx. an extra 1-2lbs. of boost.
i am asking this cause i am getting a chip
and need to tell my tuner what mods i have.
thanks, scott