From the postwar era to the mid-'80s, General Motors' Rochester ... vacuum diaphragm leaks, replace the vacuum break diaphragm unit during the rebuild. Restoring the original Quadrajet carburetor ...

Though the Q-jet was intended to be a production carburetor, Rochester engineers made sure their creation would suit the needs of the performance community. But there was a caveat attached ...

Picking up where we left off, this month we'll finish our examination of carburetor tuning by focusing on the Rochester Quadrajet ... In these carburetors, a vacuum passage applies manifold ...

Watch us rebuild a Rochester Quadrajet carburetor on a 1970 Chevy C30 using the original fuel system. This restoration demonstrates proper disassembly, cleaning, rebuilding, and tuning techniques.