Inside A 440-Cubed 400 Part II
3. With the carburetor removed and turned over, the flange differences and bolt hole spacing between the Holley used on this engine and the Rochester Quadrajet on the right are readily apparent. You will also notice the equal bore sizes (square-bore) of the Holley for performance vs. the small primaries and large secondaries (spread-bore) of the Rochester, which is a concession to economy and crisp off-idle throttle response. Holley has long been known for building high performance street and racing carburetors that offer power but little economy, at least in square-bore form (Holley has spread-bore carbs too) and the Q-jet has been relegated to economy status and generally gotten a bad rap as a performance carb due to its design and perceived tuning difficulties. However, both can be successfully modified to perform in either arena. View Related Article
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