Couple questions:Well only two types of vortec are any good the 906/l31 and the bowtie aftermarket race only heads.
Are you comparing fully ported humps to stock Vortecs? Fully ported the Vortecs will still dominate fully ported humps- and you can't make humps into Vortec heads without extensive welding.Humps still make more power once they are ported right. Vortecs can only Get mild port work cause they are so thin. Cut them to thin they will crack.