My current build is app 12.5 but running alcohol I don't spend a lot of time getting real accurate numbers. I ran the same exact starters in my 572 and 500 big blocks that ran in the 8's on race gas with higher compression. My big point was pay attention to details. Some of these starters need attention out of the box. A quick clean-up of the mounting surface with a flat file goes a long way in not only cleaning it but squaring it up. Not as much over the last two years but I run the crap out of my stuff and it doesn't sit around much. Good grounding, GOOD power connections go a long way. Our stock starters are miles above the old Chevy stuff if we set them up right. Aluminum is not a good ground and is a big reason mobile homes used to burn to the ground so often. Anything to save a buck was their moto.