A Bristol wrench is a straight splined wrench. The Standadye old part number subs up to a ground off torque socket. The problem is that it has tapered splines not straight splines like a true Bristol wrench has. I have had them explode the cam bolt.
I have also found that you need to take a punch and go down in to the bottom of the spine and hit it hard one time. This seems to loosen the cam bolt and they will come out much easier.
Just buy a small set of the Bristol wrenches. They are like Allen wrenches but with the straight splines. You can get sets for the $20 range. The one you need is about 5/16. I would have to measure it to be exactly sure. To see the screw all you have to do is take the plug out of the bottom of the injection pump. That plug is there just to give excess to the cam screw.
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