Spark plug wires with HEI and headers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**FL71C10** · 02-04-2011, 10:36 AM

I am putting the motor in my truck and need some new spark plug wires. I have a 350 with an HEI distributor and headers. Should I use 90 degree plug boots, or what? I think it would make sense to get a universal kit that I can tailor the length of the wires, but wasn't sure about the boots.

Any suggestions would be appreciated!

Thanks!

Lee H · 02-04-2011, 11:08 AM

I have a very similar set up. I'm running MSD part number 31763. I run them down the back side of the block, across near the oil pan and up to the plugs. I run the front two between the block and the motor mounts. Keeps them out of the way and looks clean.

**FL71C10** · 02-04-2011, 11:13 AM

So they run behind the headers, or underneath?

kaycee · 02-04-2011, 12:21 PM

I run wires from NAPPA that are for a 74 vette 350 and run them down behind and under headers,just like LEE said

**FL71C10** · 02-04-2011, 01:12 PM

So the spark plug boots are 90 degree angle ones?

MARKDTN · 02-04-2011, 01:40 PM

I used stock '76 truck Delco wires on 1 I did. No issues.

GASoline71 · 02-04-2011, 04:06 PM

Quote:

Originally Posted by FL71C10

So the spark plug boots are 90 degree angle ones?

They have to be... or you'll burn them on the headers regrdless of which way you route them.

Gary

kaycee · 02-05-2011, 11:08 AM

Yes they are 90degree boots

**FL71C10** · 02-25-2011, 12:27 AM

Quote:

Originally Posted by Lee H

I have a very similar set up. I'm running MSD part number 31763. I run them down the back side of the block, across near the oil pan and up to the plugs. I run the front two between the block and the motor mounts. Keeps them out of the way and looks clean.

Lee H,

Thanks for the tip. I ordered those wires from jegs and put them in tonight. They fit great. Almost ready to start it up!

Lee H · 02-25-2011, 12:23 PM

Your welcome. Hope all goes well with your build. One extra tip, keep the number 5 & 7 wires separated. As they fire next to each other in the firing order they can cross fire causing an annoying miss.

cdowns · 02-25-2011, 12:50 PM

i like cut to fit wires from taylor and the sets i've used came with both 90's and straight boots so you can use what works best

kcsa75 · 02-25-2011, 03:25 PM

Back in the day, silicone plug wires were strongly recommended with headers because of the added heat. Is that no longer the case or do all of them have silicone jackets?

dropanddrag71 · 07-28-2012, 10:09 PM

I need wires asap. I am running a Chevy small block with headers.. I notice some boots are straight and some are 90 degrees... I want to run them over the valve cover, can i still use 90 degrees on all eight?

02-04-2011, 10:36 AM	#1
FL71C10 Senior Member Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,509	Spark plug wires with HEI and headers I am putting the motor in my truck and need some new spark plug wires. I have a 350 with an HEI distributor and headers. Should I use 90 degree plug boots, or what? I think it would make sense to get a universal kit that I can tailor the length of the wires, but wasn't sure about the boots. Any suggestions would be appreciated! Thanks! __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. Last edited by FL71C10; 02-16-2011 at 09:37 PM.

02-04-2011, 11:08 AM	#2
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Spark plug wires with HEI and headers I have a very similar set up. I'm running MSD part number 31763. I run them down the back side of the block, across near the oil pan and up to the plugs. I run the front two between the block and the motor mounts. Keeps them out of the way and looks clean. __________________ 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

02-04-2011, 11:13 AM	#3
FL71C10 Senior Member Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,509	Re: Spark plug wires with HEI and headers So they run behind the headers, or underneath? __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

02-04-2011, 12:21 PM	#4
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,449	Re: Spark plug wires with HEI and headers I run wires from NAPPA that are for a 74 vette 350 and run them down behind and under headers,just like LEE said __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

02-04-2011, 01:12 PM	#5
FL71C10 Senior Member Join Date: Jun 2010 Location: Orlando, Florida Posts: 2,509	Re: Spark plug wires with HEI and headers So the spark plug boots are 90 degree angle ones? __________________ 71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now.

02-04-2011, 01:40 PM	#6
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,165	Re: Spark plug wires with HEI and headers I used stock '76 truck Delco wires on 1 I did. No issues. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project

02-05-2011, 11:08 AM	#8
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,449	Re: Spark plug wires with HEI and headers Yes they are 90degree boots __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

02-25-2011, 12:23 PM	#10
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Spark plug wires with HEI and headers Your welcome. Hope all goes well with your build. One extra tip, keep the number 5 & 7 wires separated. As they fire next to each other in the firing order they can cross fire causing an annoying miss. __________________ 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

02-25-2011, 12:50 PM	#11
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Spark plug wires with HEI and headers i like cut to fit wires from taylor and the sets i've used came with both 90's and straight boots so you can use what works best __________________ 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

02-25-2011, 03:25 PM	#12
kcsa75 Registered User Join Date: Oct 2010 Location: Kansas City Posts: 3,590	Re: Spark plug wires with HEI and headers Back in the day, silicone plug wires were strongly recommended with headers because of the added heat. Is that no longer the case or do all of them have silicone jackets? __________________ Willie Swamp Angel Truckers '72 C10 Highlander *People who blindly follow a GPS end up on television programs on The Weather Channel. Some survive, some don't.*

07-28-2012, 10:09 PM	#13
dropanddrag71 Registered User Join Date: Jul 2012 Location: Central florida Posts: 178	Re: Spark plug wires with HEI and headers I need wires asap. I am running a Chevy small block with headers.. I notice some boots are straight and some are 90 degrees... I want to run them over the valve cover, can i still use 90 degrees on all eight? __________________ " You are only coming threw in waves,... Your lips move, but i can't hear what your saying"

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