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running spark plug wires under headers

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Old Dec 23, 2005 | 01:52 PM
  #1  
white91formula's Avatar
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From: w. boylston mass
Car: 91 formula
Engine: 305
Transmission: t5
running spark plug wires under headers

anyone ever had a issue with this ? just trying to clean up the look in the bay a little bit.
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Old Dec 24, 2005 | 10:21 AM
  #2  
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From: PNW
Car: 91 Black Formula KR
Engine: 305 TPI R69/G92
Transmission: Astro A5-Pro 5.0-McCleod
Axle/Gears: US Gear 3.42 Eaton True Trac
I hope not... On my TPI, I woudl prefer it that way, that's how it comes from the factory... I bought a set of MSD specific wires, I hope they are long enough to run the stock way, I think they are better unseen on the TPI motors...
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Old Dec 24, 2005 | 11:11 AM
  #3  
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From: Alliston,Ontario
Car: 85' Z28
Engine: 383 roller
Transmission: 700r4
Axle/Gears: Ford 9" 3.70
I was thinking the same thing. I wanna do it, but there has to be a reason why no one does I'm just gonna attach some looms to the head bolts down there.
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Old Dec 24, 2005 | 11:16 AM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I got the Made For You centerbolt clamp looms and really like them. I got universal plug wires at the same time and cut to length during the install to make it as clean as possible. Not that mine is any kind of "best of show" clean, but at least the routing keeps out of everything else's way, and isn't susceptible to damage. Especially from routing too close to headers, which is what happened when I did the stock underneath routing.
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Old Dec 24, 2005 | 12:33 PM
  #5  
deadbird's Avatar
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
I run mine no other way. Plug wires are nothing to show off and look nasty strung over the valve covers or with decorative hold downs imo but, I don't like seeing any wires so....
I was running MSD pre-cut wires... a little on the short side for running under but, it still worked out fine. I used a few stratigic wire ties and never have had a problem. Next time around (hopefully soon) they will be cut to length so the aren't quite as tight.
Attached Thumbnails running spark plug wires under headers-dcp_0013.jpg  
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Old Dec 24, 2005 | 01:21 PM
  #6  
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From: w. boylston mass
Car: 91 formula
Engine: 305
Transmission: t5
ok thaks guys, looks like i will be doing this then when i get my new wires (burnt through one from it resting on the headers... yes i know)
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Old Dec 24, 2005 | 08:26 PM
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
Most people don't do it not b/c there's something wrong with it, but they don't know how to run them around the headers or don't want to build a set of cut to fit wires.



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Old Dec 25, 2005 | 10:03 PM
  #8  
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From: Alliston,Ontario
Car: 85' Z28
Engine: 383 roller
Transmission: 700r4
Axle/Gears: Ford 9" 3.70
Cool thats exactly what I want to do. I mocked it up and everything, just have to trim the wires up.
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Old Dec 26, 2005 | 04:16 PM
  #9  
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
Easiest for me is to put them onto the spark plugs and work your way to the dist. cap. Route and loom them where you want then just cut them at the terminal on the cap.
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Old Feb 26, 2006 | 07:16 PM
  #10  
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From: Winchester, KY
Car: 86 Iroc
Engine: LG4 305 Powerhouse
Transmission: Auto
Originally posted by Dialed_In
Most people don't do it not b/c there's something wrong with it, but they don't know how to run them around the headers or don't want to build a set of cut to fit wires.



Where did you get hose universal wires, crimpers, etc. Thanks,
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Old Feb 26, 2006 | 07:19 PM
  #11  
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
wires are Moroso Blue Max, crimpers are also Moroso out of Summit. MSD also makes one. I've since taken them apart and sleeved them with Moroso heat sleeve.
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Old Feb 26, 2006 | 07:21 PM
  #12  
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From: Winchester, KY
Car: 86 Iroc
Engine: LG4 305 Powerhouse
Transmission: Auto
Thanks for the quick reply. Your engine looks great.
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Old Feb 26, 2006 | 07:54 PM
  #13  
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From: So. Ohio
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4
When I put headers on my 88 I didn't think putting the wires over the top was the way to go, to much chance of buring up a wire. I had just bought a new set of wires and figured out that another set just like it would do the trick. Then the left over wires made a new set for my truck just right. Probably a better way to do it but if needed two sets of stock wires will do the trick.
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Old Feb 27, 2006 | 03:25 PM
  #14  
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From: Alliston,Ontario
Car: 85' Z28
Engine: 383 roller
Transmission: 700r4
Axle/Gears: Ford 9" 3.70
I did it too! I'm glad I did, cause everyone that sees it always asks themsleves why they didn't do that too I'm just gonna put a little bit of heat wrap where it just touches the heads, just in case.
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Old Feb 27, 2006 | 04:18 PM
  #15  
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From: Tucson, Arizona
Car: 87 Z-28
Engine: A worn-out 305
Transmission: T-5, until it dies
Just did mine too, now that I'm swapping headers in....I used the Taylor
Thunderbolts 8.2mm's with MSD sleeves....my only question is: What does
everyone use for wire seperators when your wires are about 9.2 mm's?
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Old Feb 27, 2006 | 05:05 PM
  #16  
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From: Alliston,Ontario
Car: 85' Z28
Engine: 383 roller
Transmission: 700r4
Axle/Gears: Ford 9" 3.70
I assume you mean 8.2mm wire? Lots of places sell looms, I just used the ones mine came with.
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Old Feb 27, 2006 | 05:18 PM
  #17  
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Car: 04 Silverado
Engine: 4.8
Transmission: auto
Originally posted by Dialed_In
Most people don't do it not b/c there's something wrong with it, but they don't know how to run them around the headers or don't want to build a set of cut to fit wires.



Dang that looks sharp
What was the total cost to do something like that including tools, and if the tools are expensive maybe since you already have them you could make some sets and sell them. I would be interested in something like that.
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Old Feb 27, 2006 | 05:38 PM
  #18  
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From: Pensacola, FL
Car: 1999 Saturn SL2
Engine: 4 cylinder
Transmission: 4-speed automatic
I agree, definately one of the cleanest installs of wires I have seen. I like the valve covers, too.

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Old Feb 28, 2006 | 01:27 AM
  #19  
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From: Or-eh-gun
Car: 2012 Nissan Leaf
Engine: 80-kW AC synchronous electric motor
Transmission: Automatic
Axle/Gears: n/a
the only tools you need to do "cut to fit" plug wiring is an exacto knife, and a pair of diagonal cutters ("dikes" or "wire cutters" to most of us). it is real easy. when i put 11.4 MM taylor "cut to fit"s on my 2.8 (i know, overkill, but they were on sale, and they look sweet) it was simple, they came with instructions on how to attach the terminals and everything. all i had to do is run them, mark em with a sharpie, and cut em.

when i get new wires for the GTA i am deffinatly getting "cut-to-fit" and i am deffinatly running them under the headers. just be sure to buy heat boots.
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Old Feb 28, 2006 | 09:05 AM
  #20  
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From: MD
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
You don't need the crimpers, but they make the job 100% easier. Wish I had them a while ago when I was doing a lot of plugs on LT1's,
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Old Feb 28, 2006 | 09:59 AM
  #21  
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From: Tucson, Arizona
Car: 87 Z-28
Engine: A worn-out 305
Transmission: T-5, until it dies
Originally posted by 85z28guy
I assume you mean 8.2mm wire? Lots of places sell looms, I just used the ones mine came with.
My regular 8mm wires looms do fit tightly over just the wire, but once I add the
MSD sleeving, ain't no way, no how.....
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Old Feb 28, 2006 | 10:24 AM
  #22  
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From: Harford County, MD
Car: camaro sportcoupe
Engine: 7.0L
Transmission: G-Force GF5R
Axle/Gears: Moser 9"
my car has a solid lifter cam, i route my wires under the headers so that i can have easy access to the valve covers.

i also went ahead and did it on a buddies lt1cammed 305. i love it this way and would never go back to above the headers. it looks so incredibly clean.
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Old Jul 21, 2006 | 06:13 PM
  #23  
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Car: 04 Silverado
Engine: 4.8
Transmission: auto
I finally got it done, I was even able to use the wires I already had. Looks a heck of alot better and took about 20 minutes.

[IMG][/IMG]
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Old Jul 21, 2006 | 06:39 PM
  #24  
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From: Baton Rouge, LA
Car: 89 RS
Engine: 305
Transmission: th350
Very nice. I will be doing mine like that when i buy new wires. I just have junk ones on there now with crappy wire seperators to keep them off the headers. Looks like crap but it runs, that is the only thing i car about now.
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