Rocker arm bolt specs
#3
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It is 8mm x 1.25. I tried doing it that way, but it worked better with a rocker bolt. If you grind the lips off in the area of the bend on the spring tool, a stock rocker bolt will be just the right length. Eliminating the lips is also necessary anyway to avoid scratching the valve cover gasket surface on your heads.
#5
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No, it will still have to touch just the edge of the gasket surface. After the grinding, the tool will have a flat surface that doesn't damage the head. If you take a look at the tool, it has a lip that runs down both sides; you just grind those flat or these lips dig into the head. I'll try to post a picture later today if you can't visualize it.