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I was just searching for AC R44T plugs for '73 350, 190 hp. (Have not changed to HEI yet, but considering) I read a review about fittment with headers being a problem. That even if you get the pug installed, the boot is too close and will likely burn due to excessive heat. Has anyone had this issue? If so, how did you solve the problem? Are there other plugs that can be used? Thanks for any help I get.
I installed spark plug wires that had 90* boots that attached to the plugs and was able to route the spark plug wires away from the header tubes.. I have read that headers are made to fit angled spark plug holes and also to fit straight spark plug holes........depending on which type of threaded spark plug hole your heads have. (Is it possible you have the wrong style headers?)
Wait for expert members to give you better advice.
Click on my profile. Then click on "Show all albums". Then click on "Part of my build. You will see the solution. I bought one set of burn proof boots and cut them in half, slip them over the plug wire end. The insulating boots come in sets of four and are too long anyway.
I agree with jb78L-82. Accel 9000 Ceramic Boot wires. Get the 90 degree ones.
If you have a spark plug boot very close or touching a header tube, no rubber/silicone spark plug boot will survive for long. The only solution that will last long term is the Accel 9000 ceramic boot that can withstand direct contact with a 600+ degree header tube (Accel 9000 rated for 2000 degrees and can withstand a direct flame of propane gas)................everything else is going to be a compromise and inferior long term
Last edited by jb78L-82; Jun 25, 2018 at 10:16 AM.
I ran Moroso Ultra 40 wires under my headers for awhile. I had to use the boots to cover the plug ends also due to the close clearances.Those are some heavy duty wires. I would highly recommend them. I burnt a few wires and decided to get my next set to route over the valve covers. I'm using the Davis Unified Ignition "Live Wires" now. I'm having no mores issues with the new wires. I liked the look of them but they are no way as heavy duty as the Moroso Ultra 40s.
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Last edited by Street Rat; Jun 25, 2018 at 10:40 AM.
Reason: add photo
Your reply is appreciated. I was thinking of that solution. We will be replacing current headers withe new ones this coming off season so this is what we will likely do.
Originally Posted by Mako72
I have the MSD 8mm wires with 90 degree boots. I run the wires up from beneath the Hooker headers. Been fine for over 10 years.
I gave up and went to the Accel 9000 ceramic boots. Nothing I tried would keep #'s 1 and 3 from cooking the boots. BBC with Hooker 2-1/8 sidemount headers. Since then, no problems.
One more vote for the Accel 9000 ceramic boots and wires. Even those slip-on fiberglass heat protectors did not prevent my headers from cooking the life out of the silicone boots next to my headers. The ceramic boots are resistant to the high header heat. Only disadvantage is I had two of them pull the part that clips on to the spark plug off the end of the wire inside the boot when changing plugs. Not possible to repair, but JEGS replaced them for me at no charge. I put lots of silicone lubricant on the plug now and so far have not pulled anymore apart when pulling the boot off the plug.
I installed spark plug wires that had 90* boots that attached to the plugs and was able to route the spark plug wires away from the header tubes.. I have read that headers are made to fit angled spark plug holes and also to fit straight spark plug holes........depending on which type of threaded spark plug hole your heads have. (Is it possible you have the wrong style headers?)
Wait for expert members to give you better advice.
I installed spark plug wires that had 90* boots that attached to the plugs and was able to route the spark plug wires away from the header tubes.. I have read that headers are made to fit angled spark plug holes and also to fit straight spark plug holes........depending on which type of threaded spark plug hole your heads have. (Is it possible you have the wrong style headers?)
Wait for expert members to give you better advice.
Click on my profile. Then click on "Show all albums". Then click on "Part of my build. You will see the solution. I bought one set of burn proof boots and cut them in half, slip them over the plug wire end. The insulating boots come in sets of four and are too long anyway.
Click on my profile. Then click on "Show all albums". Then click on "Part of my build. You will see the solution. I bought one set of burn proof boots and cut them in half, slip them over the plug wire end. The insulating boots come in sets of four and are too long anyway.
Thanks, I checked out your photo and appears to be a great idea. Off to C & S Speed Shop tomorrow.....
SPARK PLUG ISSUE WITH HEADERS? Anyone else?
