What's the smallest hole size you can use to run GM loom through firewall?

[Paul Y]

Originally Posted by LS short box

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.

Now that is a beautiful looking engine bay! If mine comes out a 1/5th of that I will be a happy man.

Appreciate the advice, I am going to take the plunge this weekend and start making holes.

Wish me luck....

P.