Vortec Style Head Mounted V8 Ignition Wire Loom
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These are simple and clean looking spark plug wiring looms that do not attach using the valve cover bolts.
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- Automotive
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- Creative Commons — Attribution — Noncommercial
2026-May-20: I added a 2 wire, 3 wire and 4 wire comb object.
2026-Apr-23: I added an additional style (B version) of the center loom. It's designed for wire routing OVER the rear of the valve covers. This new style does not need the "rear" loom object.
This loom was designed for a BluePrint Engines replacement small block Chevy V8 crate engine with 8mm ignition wires.
This was prototyped in PLA, but the final installed version was sent out and 3D printed in 316L stainless steel (via CraftCloud) to withstand the head and engine heat.
The front and center looms are designed to bolt into the heads using ¼"-20x2" bolts, the rear looms use 3/8"-16x3/4" bolts (both with lock washers). The bolt holes were already pre-drilled/tapped as delivered on the BluePrint H8002K heads. Torque for the 1/4" bolts only require about 35-40 inch lbs. (4 Nm) and the 3/8" bolts need about 100 inch lbs. (11 Nm) . Do not over torque, you risk striping the threads in the aluminum heads. Lubricating threads with high-temp anti-seize is highly recommended.
You may need custom length wires when using the (optional) rear looms. I found that 4 of the 8 wires from BluePrint were too short when routed around the backside of the valve covers. If you find yours are a bit short, you might want to look into these from Summit Racing: https://www.summitracing.com/parts/sum-860825r The good news is that the original BluePrint ignition wires fit when using the Loom Center Version B.
Note that if you live in the USA and offshore the 3D printing of the objects, you may have to pay additional import tariff fees (about 30% as of 2026-Apr-23).
If anyone happens to print these in an ultra high heat resistant substance other than metal (PEEK, ULTEM?) and find they hold up, I love to hear about it!