But Holley and their partners are making more and more carbs with dual patterns. Including the new Speed Demon.
Ahem.
You are aware that both the Carter and Edelbrocks AFB's also have a dual bolt pattern? And have done so for decades?
The new "TQ" from Demon is not a spreadbore carb, its designed for squarebore intakes. That's why the CFM ratings are so low (750 max), the secondary butterfly is limited to fitting the smaller squarebore opening.
Dual pattern and spreadbore/squarebore are two different things.
Spreadbore carbs never caught on in the market even though they are an excellent idea with small primaries and much larger secondaries. I doubt anyone would tool up to make a new design. You can sell just about anyone a squarebore carb but spreadbore the market is limited and there is plenty of Quadrajets out there.
