The short answer is no. But here’s the long one…
Adjustable main jets sound like a great idea. No need to buy extra jets or spend hours swapping them out. But we don’t make them and here’s why (quite apart from the fact that they look weird).
Call us old fashioned, but we want to know what jet sizes we’re running so we can balance the carburetor set-up so each is doing equal work. With adjustable jets you won’t even know whether each barrel of the same carb is jetted the same, let alone each carb. So your intake could be rich at some cylinders and lean at others. And we all know what lean cylinders can do for your engine. And what if they slip with engine vibration? In our opinion, it’s not the best way to fuel your engine.
Ok, so swapping jets the old fashioned way can be lengthy and drive you nuts. All we can say is, try to think of it as ‘all part of the fun’ – tinkering with your engine. That’s what hot rodding is all about…