| All you have to do is install longer screws into them and weld a 10mm nut to the end of each. This way you can loosen/tighten the screws from the front side and adjust the base cam timing. Advancement gives a lot more bottom end torque - very notable by the seat of pants. Or retard them for better top end power. This was an old set I did up several years ago.
 Here's what they look like today:

Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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