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03-09-2020, 09:49 PM
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#1 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,202
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HEI question
Old blue has an HEI in it from the previous owner.
And it's a 20 gauge wire from an unknown source. Anyways it broke off at the clip on my way to work Sunday, wired a temporary terminal end and went off to work. And for a more permanent solution could I use a relay to operate the hei distributor?
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" That didnt make it any newer " " Dont antique the equipment " |
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03-09-2020, 10:15 PM
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#2 |
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Senior Member
 
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,952
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Re: HEI question
Ensure any resistance wire or ballast resistor is no longer present and use 12 gauge feed wire to the HEI power connection (all the way thru from ignition sw) and ensure full 12V present.
EDIT: also, recommend look at VetteVet's posts on this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=648300 Last edited by jocko; 03-09-2020 at 10:25 PM. |
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03-09-2020, 10:16 PM
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#3 |
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Registered User
Join Date: Jul 2019
Location: Beebe, AR
Posts: 2,454
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Re: HEI question
As long as it provides 12 volts to the hei when the key is on it should work. 20 gage seems a little light.
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1967 C10 1980 Jeep CJ5 2020 Toyota 4Runner 2024 Toyota Tundra |
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03-09-2020, 10:21 PM
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#4 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,488
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Re: HEI question
14ga minimum. Can terminal into the same plug as the original resistor wire that came out of the firewall.
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03-09-2020, 10:45 PM
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#5 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,202
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Re: HEI question
I was thinking 12 or 14g wire at least.
Was curious if there was any reason not to relay it and take the load off a 52 year old ignition circuit.
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" That didnt make it any newer " " Dont antique the equipment " |
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03-09-2020, 11:03 PM
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#6 | |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,881
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Re: HEI question
Quote:
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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03-10-2020, 12:34 AM
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#7 |
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GM Addicted
Join Date: Jan 2009
Location: Visalia, Ca
Posts: 2,291
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Re: HEI question
Depin the resists wire in harness pin in a new HEI lead. Works every time! Stop
By I’ll help you out
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 ..Mac’s Garage..73 GMC, 54 Caddy, 2010 Silverado, 68 C10 RIP DAd My 73 GMC Truck Build Pic 2010 Silverado 4/6 on 24s IG:MacsGarage |
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03-10-2020, 12:48 AM
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#8 | |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,202
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Re: HEI question
Quote:
The other one was a disaster 
__________________
" That didnt make it any newer " " Dont antique the equipment " |
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03-10-2020, 08:10 AM
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#9 |
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Registered User
Join Date: Apr 2006
Location: Spring, Texas
Posts: 167
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Re: HEI question
I've had mine hooked to a relay for years.
Gives you some options for security.
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'72 3/4 Cheyenne Super 402/TH400 Gear Vendors '72 3/4 Cheyenne Super 350/200R4 '50 1/2 Chevy 3 Window |
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03-10-2020, 11:35 AM
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#10 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,660
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Re: HEI question
There's no issue with running a relay.
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72 C10 lwb fleetside -stock 350/350 combo |
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03-10-2020, 04:44 PM
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#11 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,023
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Re: HEI question
I feel that adding a relay only adds one more thing to fail to the circuit. There are millions of HEIs running around without a power relay with no problems.
If you decide to remove the Resistor/Ballast wire here is a link to how I did mine. Scroll to post 387. https://67-72chevytrucks.com/vboard/...698377&page=16
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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03-11-2020, 12:19 AM
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#12 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,202
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Re: HEI question
I've read it only pulls 2-3 amps. Maybe I will have caddy help me re-pin it.
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" That didnt make it any newer " " Dont antique the equipment " |
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03-11-2020, 02:24 AM
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#13 |
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Senior Member
Join Date: Oct 2013
Location: Garden City, GA
Posts: 295
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Re: HEI question
I used a relay because the painless harness had a smaller distributor feed wire than I was comfortable with. The relay is on the firewall, with heavier wire, and the path to the HEI is shorter now.
Before long the only original thing on the truck will be the rust. |
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03-13-2020, 04:27 PM
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#14 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,202
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Re: HEI question
Well, some multi meter testing showed 11.9v at the hot wire 12.5v at the battery.
14.2v at idle 13.6v at the distributor. Got a new clip installed and going to leave it for now
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" That didnt make it any newer " " Dont antique the equipment " |
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03-15-2020, 03:15 PM
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#15 | |
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Registered User
Join Date: May 2011
Location: mich
Posts: 655
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Re: HEI question
Quote:
 He is absolutely correct top to bottom.
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03-16-2020, 02:51 AM
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#16 |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: HEI question
I have heard they should have about a 7.5 amp fuse. Have not had one blow yet and going to step it down to 3-4 and see what happens.
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