Nope, its a security style bolt head.
Has the hex on the outside, with a certain sized dimple in the middle. There is supposed to be a special sized wrench to fit that bolt head, that has a hole in the middle of the wrench to allow it to clear the dimple in the middle.
I'd take a pic with my camera phone, but of all days, that just completely died on me too.
I'll grind it down if I have too... hell, I'll cut the GD thing off the way my day is goin... but I figured that if the auto parts place I'm gettin the MAF from would have the right size, it would be a lot easier to go that route.
2004 Buick LeSabre Custom FE5 GXP suspension conversion. 170Kmi
2001 Silverado 4WD 5.3L, 33" BFG ATs, Z71/Z82 pkg, 147kmi.