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<p>How can I determine if I have the correct vacuum advance unit for my BJ8. It has a threaded connection for the line to the rear carburetor, a spring connection to the points plate which all works/fits but no identifying marks or numbers describing its operation (min " of Hg, max " of Hg and max degrees of advance). On the same subject, what are the correct values?</p>
<p>Geoff Turl (AHCSO 67 BJ8)</p>
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