D2, Spreabores with mechanical secondaries? I thought the whole purpose was the fuel economy of small primaries and the power of big secondaries? The Carter is a Thermoquad, right? with the plastic body? The Rochester is a Q-Jet probably. GM loved those. Car Craft just did an article on tuning them. They are supposedly complex but good when set up properly(hard to do). I ignored it since all my cars have Carters or EFI. How do you get the Rochester on the stock manifold? An adapter? The factory manifold should be set up for a standard carb. Rob >Rob, the answer is yes, spreadbores. The green Sedan (Green Machine or GM) >has a Carter. Its the one where the secondaries do not have venturies, >just some needle deal that goes across (I am not sure if this is >aftermarket, but the car came with a Holley form the factory). The >secondaries are mechanically opened, but there is a spring loaded flapper >over the secondaries which is opened by the air flow (doesn't take much to >open it). This car has an Ederblock CH4B. This manifold has been >discontinued long time ago, but according to some hot rodder Mopar >magazine, its supposed to be very good for high speeds. The black LeBaron >has the stock iron manifold (the engine is from a 69 New Yorker) and has an >unusual Rochester which is even more spreadbore than the other car (ie the >primary/secondary throttle size difference is more pronounced). This carb >(also mechanically activated secondaries) is for GM products, since its box >(which I still have it, the original Holley is in it!) says GM on the >outside. D^2 > >At 05:49 PM 7/11/2002 -0400, you wrote: >>D2, >>Both your Imperials have spread bores? What intakes do you have? I'm >>mostly familiar with 70-71s, but I thought they mostly came with the >>Carter AVS. I know some came with Holleys, but your spreadbores are an >>aftermarket thing, right? >>ROb > > > >