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Here's what I would do:
By Royce Peterson - 10/31/2002 10:09:53 AM; IP 66.161.200.71
Get a single vacuum advance unit made by Accel, they are available from Summit (1-800-230-3030). The Accel unit is adjustable and costs around $35.00.

Time the engine to have around 10 degrees advance at 600 RPM with all vacuum connections plugged. With everything hooked up something like 42 - 48 degrees total works well. The vacuum advance portion should be about 10 degrees. Remember, the vacuum advance goes away at WOT under load so actual loaded timing is around 34 - 38 degrees ideally. The ability of the vacuum can to go to the 42-48 degree range at part throttle gives significant fuel economy improvement and better drivability than a straight mechanical advance distributor. It also allows for a much cooler running engine.

Search the index for vacuum advance and see numerous other posts on this subject.

Royce Peterson
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Collapse <a href=../ForumFE/reply.aspx?ID=15040&Reply=15040><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15040" onclick="return false;">Timing 390 engine...any help appreciated</a>&nbsp;-- <font color=#0000ff>Bruce Geister, <i>10/30/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15040', contentMargin: 60, icon: $('anchor15040') }); </script>  Timing 390 engine...any help appreciated -- Bruce Geister, 10/30/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15047&Reply=15040><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15047" onclick="return false;">The connections vary by specific application.</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>10/30/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15047', contentMargin: 60, icon: $('anchor15047') }); </script>  The connections vary by specific application. -- Royce Peterson, 10/30/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15048&Reply=15040><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15048" onclick="return false;">RE: The connections vary by specific application.</a>&nbsp;-- <font color=#0000ff>Bruce Geister, <i>10/30/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15048', contentMargin: 60, icon: $('anchor15048') }); </script>  RE: The connections vary by specific application. -- Bruce Geister, 10/30/2002
Collapse <b>Here's what I would do:</b>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>10/31/2002</i></font>Here's what I would do: -- Royce Peterson, 10/31/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15077&Reply=15040><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15077" onclick="return false;">Vacum Advance Unit helps to run cooler</a>&nbsp;-- <font color=#0000ff>Martin, <i>10/31/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15077', contentMargin: 60, icon: $('anchor15077') }); </script>  Vacum Advance Unit helps to run cooler -- Martin, 10/31/2002
 Above is a request for more info - Sorry -- Martin, 10/31/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15079&Reply=15040><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15079" onclick="return false;">It was very significant for me.</a>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>10/31/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15079', contentMargin: 60, icon: $('anchor15079') }); </script>  It was very significant for me. -- Royce Peterson, 10/31/2002
 Also.... -- Royce Peterson, 10/31/2002
 RE: Here's what I would do: -- Bruce Geister, 11/01/2002
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