I've got a Sanden compressor on my BBC 427. It's run with a V belt off of the crank and water pump pulley. The problem started happening after I installed Mcleod RXT clutch. Can drive normally all over but when I shift it agressively from 7500 it tears the belt. I've spent a lot of time making sure pulleys are lined up but the only improvement I could get in belt lasting is when I use the top cig belt. I'm wondering if the ac clutch is engaging at high rpm and causing the problem??? Either that or the belt just can't take it. Any killer belts out there??