Wiring harness questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76stepside · 10-09-2011, 12:02 AM

I have an 8.1L 4l80e in my 76. I just got my wiring harness and computer from Howell Engineering... what is everyone using as a grommet thru the firewall for the wiring harness? Where are you taking it thru the firewall? Also what are you using for mass air flow (stock sensor or one from a company like JET)? Any help with any of this would be great. Also did anyone have any issues with the harness being tight or just a little short in a few areas? Thanks!

67C10BUB · 10-09-2011, 10:28 AM

I wrapped my harness with convoluted tubing and passed it through the firewall using a PCV/breather grommet with the same ID.

BR3W CITY · 10-09-2011, 12:08 PM

the HELP! tree's in most parts stores have a few different grommets you can check out. I actually was able to re-use an existing grommet for my main trunk of wiring, but bought a few smaller ones for the other pass throughs I have.

Places like Parker that sell fittings and hose usually also carry some grommets.

76stepside · 10-09-2011, 05:08 PM

Ok that gives me some ideas for a grommet but where in the firewall need you pass thru, directly behind the intake or one side or the other. The engine that I got is a crate engine and Ive pieced everything together so far so there has been no extra parts to reuse so to speak. Just wondering what everyone has been doing. I know that the computer is meant to go under the hood but Im wanting to clean that up and smooth most of it out. Thats why I want it inside. Thanks again fellows!

10-09-2011, 12:02 AM	#1
76stepside Registered User Join Date: Jan 2010 Location: Fishersville, VA Posts: 39	Wiring harness questions I have an 8.1L 4l80e in my 76. I just got my wiring harness and computer from Howell Engineering... what is everyone using as a grommet thru the firewall for the wiring harness? Where are you taking it thru the firewall? Also what are you using for mass air flow (stock sensor or one from a company like JET)? Any help with any of this would be great. Also did anyone have any issues with the harness being tight or just a little short in a few areas? Thanks! __________________ 8.1l 496 4l80e

10-09-2011, 10:28 AM	#2
67C10BUB Registered User Join Date: Aug 2010 Location: Alta Loma, CA Posts: 610	Re: Wiring harness questions I wrapped my harness with convoluted tubing and passed it through the firewall using a PCV/breather grommet with the same ID. __________________ 67 5.3L Build

10-09-2011, 12:08 PM	#3
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Wiring harness questions the HELP! tree's in most parts stores have a few different grommets you can check out. I actually was able to re-use an existing grommet for my main trunk of wiring, but bought a few smaller ones for the other pass throughs I have. Places like Parker that sell fittings and hose usually also carry some grommets. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-09-2011, 05:08 PM	#4
76stepside Registered User Join Date: Jan 2010 Location: Fishersville, VA Posts: 39	Re: Wiring harness questions Ok that gives me some ideas for a grommet but where in the firewall need you pass thru, directly behind the intake or one side or the other. The engine that I got is a crate engine and Ive pieced everything together so far so there has been no extra parts to reuse so to speak. Just wondering what everyone has been doing. I know that the computer is meant to go under the hood but Im wanting to clean that up and smooth most of it out. Thats why I want it inside. Thanks again fellows! __________________ 8.1l 496 4l80e

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