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MGB Disributor clamp question

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mjsmgb67

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I put in a new one as the old was bent and pretty beat up. My question is that the two mounting holes are slotted, I there a reason? Something to do with setting timing/dwell. I am not running the stock Distributor (long story). I got the Mallory dual in there. I never knew how to do dwell on the thing. If you start with a lot of technical questions I am sure I won't know what you are talking about.:confused:

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Dwell is set by the gap between the points. The slots are probably there for minor timing adjustment and alignment of the distributor, clamp and housing.
 
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