9-5/16” CENTER-TO-CENTER SPACING for carbs with metering blocks on both primary and secondary sides SIMPLIFIES HOOK UP of standard 3/8 “ fuel lines to dual feed carbs TRIPLE CHROME-PLATED for long life and great looks USES 5/8-18 INVERTED FLARE FITTINGS which install into the original bowl fittings OPTIONAL PRESSURE GAUGE can be added to the 1/8 “ NPT port Dual Feed Fuel LineCenter-to-Center Spacing: 9-5/16" Fits Holley square flange, dual feed carburetors with metering blocks on the primary and secondary sides