8mm spark plug wire loom kit for 60s and 70s Chevrolet big blocks

Feb 2026: Decided to move a few of my models to public domain.
Also, I was never able to get a pic of the final product :(

Hello!
A coworker of mine is working on a 70s Chevelle, and needed slightly bigger spark plug wire holders. I will try and get a photo from him so I can share here.

I've updated the model with one that has slightly tighter “ears”, that keep the wire in the holder. I've also cleaned up the sketches/modeling, and decided to upload the Fusion360 file here, to make it easier to create remixes.

Absolutely print these in ABS, ASA, or Nylon. (Or any other high temp materials)
Since these will be going onto the valve cover (if I researched correctly enough ^-^), they will be exposed to quite a bit of heat. 


Supports
I suggest only placing supports as shown in green in the picture bellow, for easy removal.
(Or it can go nearly all the way inside. Just make sure to leave space on the sides so you can get a tool in to easily remove the support material)