This -6 AN adapter fitting fits most Holley 4150 carburetors with 7/8"-20 inlet.
Fitting Thread Application Chart (GIF)
This -8 AN adapter fitting fits most Holley and all Quadrajet up to 1974 with 7/8"-20 inlet.Fitting Thread Application Chart (GIF)
This -8 AN adapter fitting fits most Holley and all Quadrajet up to 1974 with 7/8"-20 inlet.