It could be a wrench for a diesel injection pump. It's been so long since i removed a pump from a 5.7 GM diesel, I can't remember if they were standard, or metric nuts. Even if it wasn't a 5.7 diesel, it could still be for another injection pump hold down nuts.
The 5.7 came out in 1977, just about the same time the metric conversion started on GM cars, and trucks.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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