Plug wire routing

bytor

Well-Known Member
How do you guys typically route your plug wires on your 383 builds with headers? I was looking at the Moroso 72195 under header wire loom setup. Any pros or cons with this setup?
 
it mostly DEPENDS ON YOUR HEADER CLEARANCE, a bit of careful thought and wire route holders and heat boots can go a long way to helping and in some cases short spark plugs help, but quality header designs make things far easier
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SMALL BLOCKS GENERALLY REQUIRE 90 DEGREE PLUG BOOTS AND WIRE FROM ABOVE
BBC engines generally use 180 or 145 degree plug boots and wire from lower under the headers but each application differs
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while wrapping the plug boot like above appears to be a splendid idea for reflecting heat and might work perfectly I suspect theres at least some potential the metallic heat reflective tape could potentially provide an electrically conductive short circuit path for ignition voltage

the ceramic boots at least in theory , when combined with heat reflective / insulating socks, like pictured below might produce a less likely electrical ground path
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Id at least suggest increasing the potential distance an electrical arc might potentially jump and use of an over the boot surface non-electrically conductive sock to be used under the heat reflective layer some what similar to these pictured below

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Id also label BOTH ends of each ignition wire, any decent label maker can produce sticky number tags far cheaper that the kits but even the kits are cheap
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viewtopic.php?f=50&t=6098&p=18837&hilit=label#p18837
3M sells these really handy number tape tags

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http://www.clarcorpindustrialsales.com/ ... -p/wmd.htm
at about $30- $45 for a fully loaded dispenser it seems expensive but its really a bargain

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ceramic plug boots are a good idea when clearances are tight
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read these, as theres tons of info


http://www.heatshieldproducts.com/produ ... eld/118/20


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Accel Extreme 9000 Ceramic Wire Sets
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ACCEL now offers the cure for burnt spark plug wire boots with Extreme 9000 Ceramic Wire kits. The 8mm Ferro-Spiral core wire now has ceramic boots on the spark plug end of the wires that will withstand up to 2,000° F. If you are running headers with close tolerances, an engine bay with little room, or an RV with boots that melt because of heat, these wire kits are the answer. and yeah! youll still need the heat resistant plug boots to prevent the wires from melting past the ceramic plug boot
FOR PLUGS...

this is an all to common issue because header manufacturers rarely check spark plug clearance with anything other than factory original cylinder heads for a listed application and even with factory original cylinder heads for a listed application, I occasionally see headers with what can only be described as PISS POOR CLEARANCE, for plugs , ignition wire and plug boots.
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the typical woven or aluminum foil reflective boot covers for protecting plug boots help but depending on the application they may not be adequate protection, it helps but over time heat still can burn thru the ignition wire insulation, the ceramic plug boots plus the shorter plugs and the heat resistant flex wire shields may be required on some headers to provide the required heat protection, and clearance, to the ignition wire
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use of shorter plugs helps in some applications,cutting a standard spark plug socket to a significantly shorter length and use of an open end of flex wrench eases access
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BTW, its not really all that rare to find that the headers you have present a spark plug wire clearance issue,

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SPACING THE HEADER FLANGE A BIT FURTHER AWAY FROM THE CYLINDER HEAD WITH A SPACER PLATE CAN AT TIMES BE HELPFUL
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that makes installing the spark plug boots in such a way that they don,t contact the hot metal surfaces almost impossible , this can sometimes be helped a great deal by the addition of a header flange, or SPACER PLATE, that MATCHES YOUR PARTICULAR ENGINES CYLINDER HEAD EXHAUST PORT AND HEADERS,
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thats significantly thicker being welded to the existing header flange , to space it out further away from the cylinder heads, obviously you don,t want to do this without testing all the clearances so installing the extra header flange with an exhaust gasket on both the cylinder head surface and between the header flange spacer and the existing headers as a test is strongly suggested as a test.
THIS IS ALSO USEFUL AT TIMES TO ADAPT THE ENGINE TO A DIFFERENT BOLT PATTERN OR SPACING

http://www.jegs.com/i/JEGS-Performance-Products/555/30790/10002/-1?parentProductId=977236

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heres where you get spacer header flange plates
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http://www.jegs.com/p/JEGS-Performance-Products/JEGS-Header-Exhaust-Flanges/1127498/10002/-1

http://www.summitracing.com/search/Part-Type/Header-Flanges/

http://www.hedmanhusler.com/Hedder-Flanges-without-Stubs

http://rehermorrison.com/product/adapter-plates/
bosch, AC delco, NGK all work

set the gap at .043-.045 and don,t forget to use anti-seize on the plug threads

http://garage.grumpysperformance.com/index.php?threads/blue-hazy-light-under-the-hood.12017/

http://www.youtube.com/watch?v=dBcl0VJh ... re=related

http://www.heatshieldproducts.com/produ ... boot/70/20


http://garage.grumpysperformance.co...e-hazy-light-under-the-hood.12017/#post-57463

viewtopic.php?f=70&t=840

viewtopic.php?f=70&t=2749

viewtopic.php?f=70&t=294
 
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bytor said:
How do you guys typically route your plug wires on your 383 builds with headers? I was looking at the Moroso 72195 under header wire loom. Any pros or cons with this setup?
According to Summit the loom attaches to the head, do you have to pull a head bolt to install them ???

http://www.summitracing.com/parts/MOR-72195/

If you can go under the headers, it will make getting the valve covers off and adjusting the valves a much easier and cleaner operation.

 
Indycars said:
According to Summit the loom attaches to the head, do you have to pull a head bolt to install them ???

I think the side loom attaches to the 'block' where the stock wire shield would normally attach.
 

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That makes alot more sense. You could rotate it to the vertical position like the BLUE line shows. You couldn't do that from the head bolt.



 

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