I suspect that those holes are for Dyno exhaust temp probes.
Tom
Salt Hawk wrote:
> I was just looking at latest HOT Rod Mags article on spark plug wires
> and notice the little hoes in the headers about an
> inch from the flange. Trying to figure out the reason for them, could
> looking down threw the holes tell you the cyl is firing different mixture
> colors ect. Input please Kvach
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