Just to really figure out how many angels can dance on the head of a pin, after thinking a little more about this there are a couple a variables that never seem to come into play when thinking of pinion angle. First the main purpose of pinion angle is nothing more then getting/keeping the needle bearings rotating in the u-joints. The other way to do this is how Ford does it, and have different length/off-set axles. The other key point, at least in my mind, is how stout of rear springs you have in the rear or are you running 4-link/Cal-Trac's, S/S springs, etc. In my way of thinking the more critical question isn't 4deg or 6deg, but how much natural axle wrap is taking place on a day-to-day basis. If you plan to drag race the car you would be looking for as little pinion angle as possible...at full song. Another way to think about this, though not directly, is the purpose of a pinion snubber is to keep pinion angle at zero, or a little less. That is why when we were running Super Stock (SS/EA) back in the 70's we didn't utilize pinion snubbers, because the springs accounted for what was desired. In the end I'm sure 4-6deg will be fine, and Val65 is correct as it is hard to get it exact....
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