Is this part stock or what ???

[drifter31]

Hey guys anyone can tell me the measurement of the stock or underdrive crank pulley for a 94GT. I just got the car and the alt amp gauge shows a little low and has a new battery and alt. I had the pulley kit on my 89GT and it ate alternators. I want to make sure mine on the 94 is stock. Right now the crank diameter is about 3/4-1in. smaller than the harmonic balancer. Is it stock or what???? Thanks Troy

 

[slopony]

I belive the stock GT crank pulley is 6.5" I think the cobra had a slight under drive pulley so maybe 6"-6.25". the real question is what size is your alt. pulley. a lot of reman. alternators from parts stores have a bigger pulley that slows down the alt. I got mine from autozone and it had the same size alt. pulley as the under drive kit.