View Full Version : Which pulley?

01-07-2013, 09:46 PM
1990 sc with aod....mods are cai and I am getting ready to gut the cats soon. Getting ready to order a supercharger pulley. Wondering which one to get....scp 5% or spinning wheels 8% (between 5-10%)....thx in advance

01-07-2013, 11:18 PM
for the mods you have now 5% might be safer...7.5% or whatever spinning wheels sells might be okay...but I definitely would not go 10%

basically 2 issues with too much OD without the correct supporting mods are:

1. too much cylinder pressure which will blow head gaskets

2. air coming out of blower much hotter that stock and will cause loss of power

good luck