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Old 11-15-2015, 02:46 PM   #1
dfosh
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Join Date: Oct 2007
Location: greeneville tn
Posts: 237
Six cyl to v8 swap

What if any changes will need to be made to the wiring harness ? I have a 68 GMC 250 six cyl and want to change to 350 with hei . thanks
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Old 11-15-2015, 08:22 PM   #2
Tony
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Join Date: Sep 2001
Location: Ontario New Yak
Posts: 843
Re: Six cyl to v8 swap

The HEI should be feed directly from the ignition switch...The fuse box has marked non fused ign terminals so you can wire it direct. Some say to use a #10 wire because the HEI can in theory draw 20 amps..... I have done it with a 10 and 14 wire and never noticed any difference....
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