strattonc

I'm not a 100% but I just bought a brand new set of march performance underdrive pulleys and just from comparing the water pump pulley thats on the car they are the exact same size, the alternator pulley on the car is smaller though compared to the march set and the crank pulley I havent compared yet just because I was going to wait until I got my a/c delete kit. Are the size differences drastic or barely noticeable? the pulleys that are on the car are like a powedercoated finish and look too good to be old ones. also the crank pulley bolts are the allen head ones like what came with the kit I bought, was that what they put on from the factory?

newpony

Depends on the brand usually,the color gave them away on mine.

nitrous_bob

the one on the crank is super small compared to stock. the others you cant tell unless side by side. but the crank pulley is the same size as the balancer i wanna say. or look at the bolts where the pulley bolts on. if they are hex they are UD's for sure

strattonc

yeah they are hex like what came with the kit I just bought and the crank pulley is the same size as the dampener.....

So good in the fact that the car already has them and I can sell the one set I just bought but bad in the fact that I cant gain anything if there is much to gain from pulleys.

Is it better to have a bigger alternator pulley or stay with factory size?

nitrous_bob

thats a tuff one. the last set of pullies i used were march pullies that bought in about 1994

i never used them again on other cars based on my charging problems i had. never in the summer but lots of dead batteries in the winter even if i turned off the heat and lights on the last 5 minutes of going home

i heard they were better now, and you might risk the chance of over spinning the alt with the stocker on there.

i dont know... tuff call

Mark O'Neal

I could tell by the steam coming out of the radiator.....