Just as thought as I read this thread.
The previous owner of my 70 GTO installed the RAlll exhaust manifolds. In addition he installed the tube that the battery cable passes thru.
It leads the + pos cable right between the hot cast iron manifold tubes on the drivers side down to the starter.
Now I pride myself on having a pretty factory stock looking car. Not 100% mind you but pretty close. In 08 during the first engine rebuild I eliminated that tube. I'm sure the Pontiac engineers had their reason for that cable route, but it just defied common sense to put an unfused, heavy cable right in harms way.
I bought a longer red cable and routed it down the front of the engine and then back to the starter. Is it factory correct ? NOPE. Out of harms way and I no longer worry about a melt down, short circuit, or catastrophic under hood fire.
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