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Old 05-18-2017, 04:55 PM   #9
FirstOwner69
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Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,854
Re: HEI to factory Tac reads tooo Hi

I've been running a factory 8 cylinder tach with a GM HEI distributor and no filter for 800 miles without any problems. It reads about 2900 RPMs at 60 MPH if I recall correctly. I have a 4.10 axle.
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