Quote:
Originally Posted by LavaSurfer
I've talked to a few shops and have searched, and I see over the years there have been different opinions. Currently my 2012 ZL1 is stock except for a Vmax ported TB and a Roto-fab intake. I have the supercharger off at the moment to swap the isolator so now is the time to press off the upper pulley. A few shops I've spoken with said to go with just an upper (2.46) while others have said just do an ATI balancer and install a 10" lower. Both of these seem to be pretty close to each other as far as pulley ratio and would accomplish nearly the same result. At the same time, I'm also doing LT's, a KPM fuel pump, and injectors as it's only a matter of time until I'm looking at camshafts, etc. I'm thinking that since I have everything off, I should go ahead and do both and just order a pulley combination that is going to net me a pulley ratio somewhere right around the same to make future changes easier.
What would you do?
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This was quite a debate many years back, but after discussing with Jannetty racing as he was a firm believer you are much better off changing the lower vs the upper as the upper is prone to slip. I have been quite happy with the 125hp package which is the 18% lower for over 10 years, but yes you do have to do a relocation kit for the belt.