Square bore means the primary and secondary bores
are the same diameter. Spread bore means the secondaries are larger
(typically...I guess it could be reversed but can't imagine why). The
theory is that the car will run better and more efficient on the primaries as if
the carb itself were smaller. When you get into the secondaries the big
honking air valve opens up and your gas guage drops noticeably
(grin).
KerryP
Patch panels fabricated Pinkertonk@xxxxxxxxx dte.net/57imperial Imperials -- 50 Limo, 57 roadster, 61's, 62, 68 Convert, 73, a 66 300 and a bunch of lesser marques
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