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5/8/11 11:23pm - Original Message: 'spark plug wires'
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Gordonvillle, TX - USA

1968 Roadster 427

Joined: 11/28/2003
Posts: 222
Just got back from a car show in Plano Texas, "Cars and Coffee"  But the 68 making the drive home of 65 miles and my new headers were cooking the plug wires and the engine was missing out before we got home. The plug wire were extremely hot. 
The plug are going over the valve covers rather than below the headers. .
Don't know which way is best. 
My question is what plug wire is the best to have to resist the 500 plus temp that is in the engine compartment and is it better to go under or over the headers for the wires. The engine is a 350. 



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5/9/11 12:42am - Reply: 'spark plug wires'
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Oak Creek, WI - USA

1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
Go under the headers.  Heat Rises!!!!  Use silicone plug wires.
Thats my story and I'm stickin to it!!!


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5/9/11 11:56am - Reply: 'spark plug wires'
74-454 Lifetime Member
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, - Canada

Coupe 74 - 454 Drive it like you stole it!

Joined: 8/6/2004
Posts: 533
Same here.  Went through 3 sets of wires already.  74 big block with headers.

In my case, because of the length of the wires; my problem is the boots.  I couldn't always route the best way or bend them enough so they don't touch the headers.

Here's what I'm doing next :
-get new set of boot protectors
-get the Summit Racing MOR-72550 wires (the price is right; I tried 125$ sets and burned them too).
-route the wires under the headers (the best I can) and use metal routing clips to help out; hold them in place.  Some of them are bolted with the head covers.  Some others are inside the spark plug hole; so it adds a later between the wire boot and the header.

And if it's still too hot; since my engine doesn't shine one bit and I don't display it; I'll wrap the headers.

Let us know what you do and how it works out.

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5/9/11 12:14pm - Reply: 'spark plug wires'
spielman5 Lifetime Member
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1965-327 coupe, 1968-small block coupe, 1969-427, 1971-454 coupe and currently a 1976-ZZ4 coupe reborn again,and hotter than ever.. Add a 1996 CE LT-4 for backup

Joined: 10/12/2004
Posts: 2193
I use spark plug boots over the plug and wire leads, they are good to 1200 degrees and you can get them in colors, check out Summit, Jegs, or your auto parts store..Terry


   "I Love all Corvettes! LifeTime Member #60..Terry"
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