I had similar issues in my first 2 efforts, but they were a kit, with water pump pulley, alternator and crank pulley. Ended up using only the ctank pulley and 3 sets of belts, not cheap. G8 no issues at all, just uses the crank pulley and added 50 rpm to idle only slightly dimmed lights with AC and defroster on. Was never a problem and performance was well above its pay scale