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#1 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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I've been trying to get my 1968 C10 to pass smog. In Nevada it's 1967 or older don't require smog. Some say to get classic plates but that limits you to only driving 5000 miles a year. Some say to just disconnect the odometer cable.
It passed fine last year so I don't know why it wouldn't today. It's failing on the Hydrocarbons. I found out that the plug wires on cylinder 5 and 6 are burning up on my headmann headers causing misfire which explains the high hc levels. These are the 2 pair of plug wires I have put on them. I even put heat shields over them this time and the headers still burnt through them. I'm going to replace the 2 wires that burnt up but was wondering if there is any heavy duty heat shields that can help. If not, I will have to reroute them so that stay away from the headers. |
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#2 |
Registered User
Join Date: Jul 2012
Location: houston,tx
Posts: 175
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Re: Plug Wire Burning on Headers
http://www.oreillyauto.com/site/c/de...6+wire+shields
try these i have them on my truck and i also have headers this was the only way i stopped burning my wires! |
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#3 |
Senior Member
![]() Join Date: Feb 2011
Location: Corona, CA
Posts: 1,840
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Re: Plug Wire Burning on Headers
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MusicMan70 1961 GMC Suburban |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Plug Wire Burning on Headers
i too believe in those plug boots
all sparkplug wires are not created equal// i never had a heat problem with top of the line taylors
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#5 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Plug Wire Burning on Headers
How are they routed? I have no problems with burnt plug wires from headers and I run them up and away from the headers. No heat shields ever. I also prefer Taylor. They are the best
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#6 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
They run from the distributor along side of the valve covers and down in between the header pipes. The issue is only on 5 and 6. those were the hardest spark plugs to change. I actually had to get those from underneath with a open end wrench. The Heddman Headers were existing so I didn't mess with them.
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#7 | |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
Quote:
Before I changed these plugs and wires. number 6 had a heat shield on it. It was like a foil tape almost. It was old so I threw it out. |
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#8 | |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
Quote:
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#9 |
Registered User
Join Date: Jul 2012
Location: houston,tx
Posts: 175
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Re: Plug Wire Burning on Headers
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#10 |
Senior Member
![]() Join Date: Apr 2008
Location: Franklinton NC
Posts: 1,309
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Re: Plug Wire Burning on Headers
They make shorty plugs to give you a little more clearance for this reason. Maybe those would help.
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#11 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Plug Wire Burning on Headers
I have Headman Hedders on the 350 in my rig, with MSD wires and 90 degree boots. Never burned a single wire, and the MSD boots are pretty bulky.
You're not trying to use straight boots designed for manifolds are you? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#12 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
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#13 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
I'm not trying to use straight boots at all. I'm using MSD wires with 90 degree boots.
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#14 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Plug Wire Burning on Headers
How close is the boot to the header?
Posted via Mobile Device
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#15 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
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#16 |
Registered User
Join Date: Dec 2010
Location: livingston co.mi
Posts: 2,457
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Re: Plug Wire Burning on Headers
I like routing them down and under the headers
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California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project |
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#17 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Plug Wire Burning on Headers
MSD wires burning up several inches from the tube? That thing is getting way to hot.
Posted via Mobile Device
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#18 | |
RAT1968 '68 Cab/'71 Parts
Join Date: Feb 2002
Location: Coarsegold, CA
Posts: 2,375
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Re: Plug Wire Burning on Headers
Quote:
But if they are not touching, and burn through when the wire is two inches away from the header???? Something else is rotten in Denmark. If your timing was too advanced, or you were running waaaay lean, I'd suspect you'd have already had a bigger problem... .....But what do I know? ![]()
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M17 Coarsegold, CA RAT's shiny now. But always a rat. |
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#19 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Plug Wire Burning on Headers
You need some sort of wire loom that will allow you to bend the wires around the tubes and hold them in place. The cheap wire looms that come in the kits isn't enough.
So it's not the headers or the plug boots... it the looms that are causing the problem. I am using some cheapies that I got from Summit. They bring all the wires together, and then run them to each plug. They work pretty decent for the price. But there are cleaner, and albeit, better options out there. Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#20 |
Registered Cruiser
Join Date: May 2002
Location: Las Vegas NV
Posts: 2,230
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Re: Plug Wire Burning on Headers
^^ What cliff said
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I intend to live forever. So far, so good. |
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#21 |
Registered User
Join Date: Aug 2012
Location: error 404 location not found
Posts: 816
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Re: Plug Wire Burning on Headers
Mine are also ran under the headers with accel 300 plus. Didnt burn them after about a thousand miles but I think your header is getting way too hot if its burning through the shields
Posted via Mobile Device
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1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll |
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#22 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
I don't know why these photos show up side ways. I use wire looms that bolt to the valve covers. The heat shield actually has some contact with the headers. The heat shield doesn't look or feel burnt but when I remove it the wire is burnt. I don't think my headers are getting too hot. The Engine temp is still 185-195 F. I'm just going to have to route 5 and 6 under the headers. |
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#23 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Plug Wire Burning on Headers
I see, those are the same looms I use. You have them routed to close to the exhaust. Try to pull more wire through so they almost touch each other as they curl down and then toward the plug, see picture. With the way that top tube runs, looks like you are going to have a continuing problem. My 5 wire is 1 1/4 inch from the tube and has never burnt.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#24 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
|
Re: Plug Wire Burning on Headers
You can also bend a tighter radius in the bracket to get the wires closer to the block. I did that.
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#25 |
Registered User
Join Date: Jan 2013
Location: Las Vegas,NV
Posts: 59
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Re: Plug Wire Burning on Headers
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