I Might Just Know What I'm Talking About
Join Date: Oct 2000
Location: C-ville, VA
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Re: factory 4bbrl intake for a 360 HELP
If I remember correctly, then Square Bore only means that it is equal distance around (kinda like if you draw a square around all the holes), and that a Spread Bore would have two holes outside of that square (so that if you drew lines around outside, it would appear as a triangle with the top cut off).
I don't think that the hole size has much to do with it, just the relation of the front set to the rear.