[Shelboss]

I have owned my Autolite Inline and Cross Boss manifold since the mid seventies. It was my senior project in college to get it to run on the street. There are a few problems with doing this on a Cross Boss and Boss 302 engine. First off, the carburetor is too big for 302 cubes, so either stroke the motor or put smaller venturis in it. Mine is now set up to be between 750 and 780 cfm estimate. Second is there is not enough velocity in the manifold to run under 3000 rpm. It does not cruise, but man does it go when you step on it! It would not idle either, you get a rich/lean condition as the velocities and vacuum fall off. I designed a 3 piece shaft assembly that operates the two inner barrels as primaries and opens the outer two barrels with Holley vacuum diaphrams. The accelerator pump cams have set screws and slots that mechanically close the outer barrels when the throttle closes. The carburetor now idles at 800 rpm and has no bog or flat spots. Gas mileage is in the 10-12 mpg range with a modified Boss 302 with 12.5:1 compression. If you really want to run an Autolite Inline on the street, get two and put them on an independent runner manifold or be prepared for a lot of work!