I'm building that exact combination right now. I have a V1 gearset but Si impeller upgrade. Unless you specifically order a V1 HD head unit, the bearings are limited at the same 52k as the V2 gearset. I learned this from Vortech directly when I had them rebuild my head unit two years ago. Either way you're stuck at 52k max. So just use Vortech's calculator and figure out the pulley combination you need for your step up. I'm hoping with my setup a max torque of around 530-550 and spinning it to 7k. No idea what HP will be but math says assuming the Vortech can keep up, 640-650. At that RPM a 3.33 will be the smallest pulley I can run without overspinning. I'm going to start with a 3.60 and work my way down. I don't plan on putting a super aggressive clutch in and I have a 10 spline T56.
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