Bingo! Thanks, John, that's what I originally thought long ago, but what Dave says is spot-on. I have seen many this way, clearly by design. I have searched many carb books for the answer, but they all insist that ALL AFB's have the counter-weighted butterflies. How in the world can something this big be such a complete secret?? Sean Dave Casey wrote: > > No, they exist without the extra buttterflies. My 65 413 carb doesn't > even have room for the counterweights. > > Dave Casey > > ----- Original Message ----- > From: "john althaus" <althausjbl@xxxxxxx> > To: <1962to1965mopars@xxxxxxxxxx> > Sent: Monday, April 07, 2008 7:06 PM > Subject: Re: Secondary butterflies > > > > > > > > Sean, I think this answers the questions about the older AFB's, as a > > youngster we used to remove the "valves" thinking the stumble was power! > > My guess would be the ones you have seen with out the "valves" had them > > removed in a prior life. > > > > John ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.