I think what Tim is saying is that squarebores often have a slightly different front to rear thottle bore. Its just not as extreme as the Thermoquad and Quadrajet's.
Exactly! :thumbsup: Square bore means, the center line of all four ventures, form a square. Spread bore, the rear two ventures center lines will not line up with the front two,
Square bore can have what ever size difference ventures, but the centers still line up.
