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Old 01-03-2016, 11:39 PM   #18
geezer#99
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Join Date: Aug 2009
Location: Bowser
Posts: 13,973
Re: HEI Compression Test Question

Get a timing light and set your initial at 14. Plug off the vac advance when you set it.
Your idle will increase, so turn it back down and adjust your mix screw. Then hook your vac hose back up.
14 is a start point. You might end up a few degrees higher.
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