Affordable Holley four-barrel performance rebuild kits from Quick Fuel TechnologyStory and photos by Joe WoodsThe Holley 600cfm vacuum secondary four-barrel (PN 0-1850) offers a good balance of performance and fuel economy on most small-block powered street rods, and used examples can be found on shop shelves and at swap meets around the country. We thought Holley's little workhorse would be a good candidate for a Quick Fuel upgrade.
Our little four-barrel was a pretty basic carb, tuned more for economy than performance. We decided to upgrade our Holley with a new QFT adjustable billet vacuum secondary module, which allows you to regulate when the secondary throttle plates open, giving the driver added control over fuel economy and power. Originally, our Holley used only one metering block on the primary side while the secondary side made due with a drilled metering plate located inside the bowl. By adding billet metering blocks to both sides, we both improved the fuel flow and provided the ability to change secondary metering to allow for improved performance tuning. By machining the blocks from billet, QFT eliminates the porosity and surface imperfections that cause cross-well bleeding and lost performance in many cast metering blocks.
Most of the parts we needed for this rebuild are included in the QFT Performance non-stick gasket kit (# 3-200). We also ordered a billet primary metering block (# 34-8 ) and secondary metering block conversion kit (# 34-66). The adjustable vacuum secondary kit (# 63-1) rounded out our rebuild parts list.
Source:
Quick Fuel Technology
129 Dishman Lane
Bowling Green, KY 42101
ph 270-793-0900
www.quickfueltechnology.comJustice Brothers
2734 East Huntington Drive
Duarte, CA 91010 U.S.A.
Telephone: 626.359.9174
What we have here is a staple of American automotive history. It's a basic 600cfm Holley four-barrel, vacuum secondary carburetor with half a decade of accumulated shop crud.
