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#1 |
Registered User
Join Date: May 2012
Location: Central TX
Posts: 222
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HEI Swap ('72 1500): Parts List
Hi All,
I am finally going to do an HEI swap for my '72 1500 V8 350. To make things easier on myself I figured I would get recommendations on what parts I will need to get. Since I do not know how long ago the PO installed ignition items I am going to go ahead and get new plugs, wires, cap/rotor as well. I assume I can just use the same ignition coil? I just bought a new one a couple weeks ago. HEI: Something from a late 70s Chevy Plug Wires: 76-78 Vette or Taylor 8mm Wires Plugs: ? Cap/Rotor: ? Anything I might have missed? Also if anyone has specific part numbers from when they did their conversion would be helpful as well.
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#2 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: HEI Swap ('72 1500): Parts List
Most HEI coils are integrated into the cap.It's a different style so you probably need a new one.Somewhere member "shifty" has a great write up on doing this to a 6.It has lot of info on how to wire it,parts # for electrical connectors and such.The HEI requires 12 volts so you will need to replace the resistor wire that is powering the coil now.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#3 |
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Location: Central TX
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Re: HEI Swap ('72 1500): Parts List
I found that thread. I had not noticed it listed out the parts. I assume I would just have to change some things around.
Here is a link to the thread to keep things in one place for me: Shiftys HEI Swap
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#4 |
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Join Date: Sep 2012
Location: San Antonio, TX
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Re: HEI Swap ('72 1500): Parts List
I just did this on my 72 as well. Pretty straight forward. I got the plug wires for a 75 vette and they fit pretty good
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#5 |
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Re: HEI Swap ('72 1500): Parts List
just make sure you run a wire that has a full 12 volts from the ign. side of the fuse box, don't use the ign wire for the point dist. hot with ign. on and off when ign is off...
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#6 |
20' Daredevil (Ret)
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Re: HEI Swap ('72 1500): Parts List
You probably know this already, but since it hasn't been mentioned in this thread..... plugs are same as stock, and gapped at .045".
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
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Join Date: May 2012
Location: Central TX
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Re: HEI Swap ('72 1500): Parts List
Thanks for the reminder on the plug gap and ignition wire change.
@1972SUPERSB, what HEI did you go with? Can I go with all my HEI related parts from a '75 vette as well or is there a cheaper option?
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#8 | |
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Re: HEI Swap ('72 1500): Parts List
Quote:
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#9 |
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Re: HEI Swap ('72 1500): Parts List
Accidentally entered the post twice
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#10 |
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Re: HEI Swap ('72 1500): Parts List
Looks like that part number is on sale for $125. Guess I'll go ahead and finally take the plunge and move to HEI. Thanks for the part number.
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#11 | |
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Re: HEI Swap ('72 1500): Parts List
Quote:
Shawn
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#12 | |
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Re: HEI Swap ('72 1500): Parts List
Quote:
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#13 |
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Re: HEI Swap ('72 1500): Parts List
I'm not sure about the mounting differences between the two styles.. You might just send them a note and see.. Seems they were pretty responsive when I asked about the tach drive distributor for the Vette. Otherwise, yes, you could always replace it if it's not right.
Shawn
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-- '67 Chevy Stepside 250 Inline 6 Megasquirt Fuel Injection T5 5 speed conversion Ferric Oxide impregnation throughout |
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#14 |
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Re: HEI Swap ('72 1500): Parts List
Looks like it would work as is. Now decision between that one or an acdelco part.
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#15 |
GobbleStalker Calls
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Re: HEI Swap ('72 1500): Parts List
So what happens if you do use the points power wire?
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72 Chev Longbox Highlander edition. Med Olive/White/ Med Olive 350 4bbl with 350Turbo trans. Truck currently under construction. Project Cappaccino. Stay Tuned! 1967 Chevy C10, 327, 4.11 posi 3 spd. The Driver Truck! SOLD! 09 GMC Sierra SLT All Terrain pkg. 2014 Jeep Wrangler Sahara unlimited. ( The wifes ride ) |
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#16 |
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Re: HEI Swap ('72 1500): Parts List
The original point power wire is a resistor wire, and only supplies about 7~8 volts. This keeps the arcing down between the points (along with the condenser). If you try to run the HEI with that level of power, your spark will be weaker and it can drop out at mid RPM's. Some ignition modules won't fire at all at that voltage.
Shawn
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-- '67 Chevy Stepside 250 Inline 6 Megasquirt Fuel Injection T5 5 speed conversion Ferric Oxide impregnation throughout |
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#17 |
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Location: Klein Texas
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Re: HEI Swap ('72 1500): Parts List
The ignition coil is basically a step-up transformer. Lower voltage in will produce lower voltage out.
It makes it harder to fire the plugs.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#18 | |
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Re: HEI Swap ('72 1500): Parts List
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#19 |
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Re: HEI Swap ('72 1500): Parts List
I agree the price seems just too good. I went with the acdelco part that superswb posted earlier. Now to figure out the current problem with my remoter starter solenoid.
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#20 |
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Re: HEI Swap ('72 1500): Parts List
Well got the distributor in. I am just waiting on my new harness to get in.
I am curious about get the distributor at TDC. Any tips on how to do this?
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#21 |
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Re: HEI Swap ('72 1500): Parts List
What I did was take out #1 spark plug which one on drivers side closest to front of truck. Then manually turn engine with a ratchet using the bolt on the balancer until you feel compression coming out of the hole where the #1 spark plug was. . Once you feel compression then the mark on the balancer should be close to the timing tab on the engine. This means your engine is at top dead center on cylinder #1. This is how I did it. Others may have different ways to do it.
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#22 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
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Re: HEI Swap ('72 1500): Parts List
Ugh... I wouldn't use one of those china made Skip White distributors in any vehicle. There has been some testing by a one of the guys on here and the distributor isn't as grand as it seems. So yes... the price is too good to be true. There are some that use them and get lucky...
You need to have the engine at TDC as per your service manual. Plop the distributor in the hole with the rotor pointing at the #1 plug wire. Then bump the starter until the Distributor fully seats. EZPZ. Gary
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#23 |
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Location: Central TX
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Re: HEI Swap ('72 1500): Parts List
I got the GM ac delco starter. Decided I'd rather spend the money on this part.
To bump the starter I'd need something like this: Remote Starter Switch
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'72 GMC Super Custom 1500 350 V8 w/AC |
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#24 |
20' Daredevil (Ret)
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Re: HEI Swap ('72 1500): Parts List
No question that's probably the best way, but not absolutely necessary. You can pull the old and drop in the new as long as you mark exactly where the rotor is pointing and make sure the new one drops into the same position. And of course don't bump the starter or otherwise rotate the engine.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#25 | |
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Re: HEI Swap ('72 1500): Parts List
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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