Burned plug wires.

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Byron Gray

Byron Gray

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Belfair Washington
On my small block I have those headers where that one tube goes right across the head. (See picture, its an older picture the only one i have right now showing that side) I have had a few plug wires burn threw lately mostly on cylinder 5 and one on 7. I had wrapped the header tube with the heat wrap and then put a heat tape around the plug boot with those slide over sleeves as well. That worked for awhile but in a weekend #5 burned threw 2 boots. They all have had straight boots on them so im thinking a 90 degree boot.

I've been looking into other options on heat protection until I can swap out the headers so im wondering what has everyone els done with these headers to save plug wires.

Screenshot_20200729-172736_Facebook.jpg
 
I'm wondering if your headers are creating excessive heat.
Is this happening in competition?
Or is this a street-engine?
Are you running a Vcan?
A streeter IMO, HAS to have a v-can. The power timing is only the max WOT timing. For ALL other load and rpm settings, without a Vcan, the timing will be retarded. When this happens the mixture finishes it's burn in the headers.And they get very ,very, hot.
If this is a street engine, Ima thinking your ignition timing is late.
 
Last edited:
Its a street engine My ignition timing is all mechanical advanced and I havent noticed any issue with how its set timing. Its only burning 5 and 7 i havent had an issue with the other cylinders..

1969VADart. I have those but the dei ones and I may have to try those to see if moroso is any better

Doug 317 I was thinking the 90 degree boots
 
I run Taylor wires on my 440. I bought some MSD replacement boots (I liked) and crimping tool. I left my wires long so I can change the boots if they get burnt but have been lucky and haven't had to do one yet. Sounds like a 45' or 90' boot may work for you.
 
Byron Gray said:
On my small block I have those headers where that one tube goes right across the head. (See picture, its an older picture the only one i have right now showing that side) I have had a few plug wires burn threw lately mostly on cylinder 5 and one on 7. I had wrapped the header tube with the heat wrap and then put a heat tape around the plug boot with those slide over sleeves as well. That worked for awhile but in a weekend #5 burned threw 2 boots. They all have had straight boots on them so im thinking a 90 degree boot.

I've been looking into other options on heat protection until I can swap out the headers so im wondering what has everyone els done with these headers to save plug wires.

View attachment 1715569831
Click to expand...

MSD 8.5 wires , with adjustable plug ends, wrap them anyway , WORKS.
 
Byron Gray said:
On my small block I have those headers where that one tube goes right across the head. (See picture, its an older picture the only one i have right now showing that side) I have had a few plug wires burn threw lately mostly on cylinder 5 and one on 7. I had wrapped the header tube with the heat wrap and then put a heat tape around the plug boot with those slide over sleeves as well. That worked for awhile but in a weekend #5 burned threw 2 boots. They all have had straight boots on them so im thinking a 90 degree boot.

I've been looking into other options on heat protection until I can swap out the headers so im wondering what has everyone els done with these headers to save plug wires.

View attachment 1715569831
Click to expand...

MSD 8.5 wires , with adjustable plug ends, wrap them anyway , WORKS.
 
You have to be careful how you route the wires...

One thing I like to do it use the 67 -68 valve covers that have the spark plug wire clips on the top of the valve cover to secure the wire and help keep it off the exhaust...
 
90° boots and run them up from below the headers, when did that with my small block never burnt another wire.
 
Byron Gray said:
On my small block I have those headers where that one tube goes right across the head. (See picture, its an older picture the only one i have right now showing that side) I have had a few plug wires burn threw lately mostly on cylinder 5 and one on 7. I had wrapped the header tube with the heat wrap and then put a heat tape around the plug boot with those slide over sleeves as well. That worked for awhile but in a weekend #5 burned threw 2 boots. They all have had straight boots on them so im thinking a 90 degree boot.

I've been looking into other options on heat protection until I can swap out the headers so im wondering what has everyone els done with these headers to save plug wires.

View attachment 1715569831
Click to expand...

I have the same design tubes and used a section of heat wrap folded over 3 times between the wires and tube.
Been like that for years without one burn through.
 
need a set of tti's or dougs.. :)

if you insist on keep those cheap garbage headers then you'll need a 90* boot or some vari angle boots so that you can loop them around that header tube. never understood why they built such a stupid design.

fan shroud 020.jpg
 
abodyjoe said:
need a set of tti's or dougs.. :)

if you insist on keep those cheap garbage headers then you'll need a 90* boot or some vari angle boots so that you can loop them around that header tube. never understood why they built such a stupid design.

View attachment 1715570098
Click to expand...
I do have a set of block huggers im going to put on when I get a chance. I do not like these headers they look like garbage to.
 
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