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HEI swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by xnoahx, May 27, 2001.

  1. xnoahx

    xnoahx 1/2 ton status

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    Im going to swap an HEI into my 73 k5 and was wondering if i have to get a new wire from the fuse block on the engine side. Ive heard that these are sometimes resistance wires with only 6 volts and that HEI's need 12v. My truck has a ballast resistor so would this mean that it has 12v and the resistor lowers it to 6v? any help would be great. Thanks
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    I just sold a 74 pickup this evening. It had been converted over. I would have gone out and checked it for you. I do remember that the feed for the dist had been spliced. Sorry I can't tell you more.
     
  3. Michael

    Michael 1/2 ton status

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    Yes, you need a good 12 volt "ignition" source wire. The resistance wire doesn't drop it to 6V, but your HEI will like a good 12 much better. I can see where I got mine from if ya need it.

    Michael

    Michael[​IMG]
    <A target="_blank" HREF=http://www.jmartin.net/parker/goose.htm>http://www.jmartin.net/parker/goose.htm</A>
     
  4. xnoahx

    xnoahx 1/2 ton status

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    Yeah, if you could check it out, that would be really helpful, im also not quite sure how i would run a wire through the fuse block. thanks
     
  5. '73 K5

    '73 K5 1/2 ton status

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    Michael is right. You will need to run a wire to the fuse block. Put a female connector on some 12-14 gauge wire, plug that end in the dist. cap and run the wire through the firewall and tap it into a fuse that only has power when the key is in the run position.

    '73 K5
    Chevy good...Ford bad
     
  6. xnoahx

    xnoahx 1/2 ton status

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    That sounds good. Thanks for the help
     
  7. Michael

    Michael 1/2 ton status

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    xnoahx, sorry it took me awhile to get back. I ran a wire from the distributor....snaked it thru the grommet where the speedo cable comes thru the firewall.....then down to the fuse box. Right about in the center there is a male spade terminal marked "IGN".

    Michael[​IMG]
    <A target="_blank" HREF=http://www.jmartin.net/parker/goose.htm>http://www.jmartin.net/parker/goose.htm</A>
     
  8. TX Mudder

    TX Mudder 1/2 ton status

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    I converted my 73 k20 from points to HEI.
    The points are supposed to recieve a 6V wire. There IS a resistor inline. Simplt follow the power wire from the coil to the fuse block and you you will find it. I cut the resistor out and spliced the wire together, then dropped in my HEI. Runs great.
    -- Mike
     

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