I just used a set of 12 points on my Falcon headers from percy, I think. They have a set screw that pushes a plunger in the center of the bolt. The plunger works to spread the ends of the bolts that are sloted. They basically mushroom inside the head to hold the bolts in place. A friend recommened them. He has used them for years on a couple of drag cars and they have never loosened
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