The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What's the smallest hole size you can use to run GM loom through firewall?

LS short box · 03-07-2023, 06:03 PM

Pic of my 68 C10 engine compartment. You can just see the harness grommet behind the right cylinder head. Start small and open it up as needed. Feed the big connectors thru first. Be careful as you feed the harness thru the fire wall and nick a wire. I've used Speartech harnesses a few times. Top notch stuff.

03-07-2023, 06:03 PM	#4
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,953	Re: What's the smallest hole size you can use to run GM loom through firewall? Pic of my 68 C10 engine compartment. You can just see the harness grommet behind the right cylinder head. Start small and open it up as needed. Feed the big connectors thru first. Be careful as you feed the harness thru the fire wall and nick a wire. I've used Speartech harnesses a few times. Top notch stuff. Attached Images