Set the hood down on a pair of 2x4x4 blocks with a hole for the hood pin in the centre of the 4 inch side.
Place a towel of 2 layers over the infected area.
Set a clean big block cylinder head on towel and leave it for at least 5 days.
Repeat if necessary.
Without knowing the extent of the bow and if the hood may have previously been repaired, there’s no way to say if this will work, but based on my experience this is a long shot. I believe there is a gross underestimate on the role the bonded under support plays and the ability to overcome that stiffening with heat and weight.
