I get the header idea, but, if it started I would think the exhaust pressure would be mostly in an exhaust direction. Thereby blowing most of the rust out! Reversion when the engine is running is way less than exhaust pressure. We're talking a lot of foreign debris to cause enough build up to fill the quench area.
Not to mention he's finding it in the intake as well. That's a lot of reversion. If he's getting it from the headers he has other problems to make it all the way to the intake. IMO
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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