I'm sorry, don't take this personal as the consumer, but the idea of a company making and selling a metal separator to customers is just stupid. They should be shot for doing that.
If a customer ever cross-fires a rising piston on a compression stroke the customer is screwed. It will bend a rod or break something if the engine is spinning fast.
I use plastic molded separators. The rule I follow is never to run two adjacent distributor wires any distance, and to hold my wires apart and away from other wiring or metal as much as possible.
For example, with a 1-3-7-2-6-5-4-8 order you have a potential crossfire issue with 1 and 3 on the right bank and 6 and 5 on the left bank. If 1 cross fires to 3 it can ignite 3 on the upstroke. If 6 talks to 5 it can fire 5 on the upstroke.
This is why you never want to risk an unnecessary path between adjacent posts on the distributor. You could get an extra 90 degree spark advance ignition on the next cylinder, and sometimes that causes severe damage.
When I wire a distributor with a 13726548 order I place the right bank in 1-2-3-4 order all the way to the distributor with spacing between wires. I place the left bank 5-7-6-8 to the distributor. This way if any wire cross talks spark to an adjacent wire it is at least 180 plus advance out of cycle. The problem I have with an ungrounded metal spacer is if the wire punches through to the metal, it can cross talk to any other plug wire in the loom.
It may never to one person in one lifetime, but if 100,000 of them are out there it can happen to someone somewhere. It's like buying a lottery ticket. The dumbest thing I ever see is someone lacing all the wires in a tight bundle, but a metal spacer is right up there second place.
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89 LX. 363, single turbo S482 FMW, Super Vic EFI, Fox Lake Stage III heads, solid roller, glide. Holley HP EFI. (varies)