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Old 12-14-2013, 01:02 AM   #8
chevyrestoguy
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Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
Re: Factory Tach and HEI Question

GM put tach filters on all of their tach-equipped HEI models back in the day, and there was a reason why They are an RC filter that is designed to remove high frequency noise from the tach line. They smooth out the spikes in ignition system. I would try that first.

Here is an ebay ad for a factory GM filter:
http://www.ebay.com/itm/1978-TO-87-T...df7b56&vxp=mtr
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