I'm not sure Mike, but I think they may build the adjustment provisions into them. I think
George's record speaks pretty much for the carb. If you aren't running all the threads, he's gone for the weekend, gonna be a day or two before you hear back from him. You can try the askEC forum link in his signature, not sure if Jon frequents that over the weekend, but there should be a thread or two concerning any questions you have there.