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A header leak under load seems most logical for my first thought too!
It would be hard to hear at idle.
Use a piece of garden hose held around the header with the other end to your ear.
Look for a white powder spray around joints to the head and down to other pipe connections. Use a mirror to look on the under sides.
The next thing it could be is a detonation ping. But the knock sensor, if used on this car, should take care of that. It would have to be a large load unless your basic timing so way far off. Rare!
Valve tappet clearance noise doesn't change under a load and go away at idle.
Got to snoop more and have better descriptions with a location.
Will wait with you,
Phil
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