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5019 hits | 70.04 KB | Posted: 1/16/07
This screw allows adjustment of the vacuum secondary. If adjusted correctly, it will open smoothly without any surge or lag in power delivery.

Here is the finished product, from a useless paperweight to an affordable and totally adjustable performan...

qft31.JPG
4791 hits | 54.62 KB | Posted: 1/16/07
Install the secondary bowl and metering block with the new gaskets. Be sure the connector tube seats all the way into the bowl as you tighten the new longer bowl screws.

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4638 hits | 62.03 KB | Posted: 1/16/07
The original connector tube wont be long enough to reach the secondary bowl after we add the new secondary metering block. QFT provides this longer aluminum one with an improved seal design in the correct length.

The connector tube just presses in...

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4901 hits | 62.35 KB | Posted: 1/16/07
Install the new needle and seat assemblies by simply dropping them into the holes and pressing lightly with your finger to push the o-ring seals into place.

qft25.JPG
4912 hits | 61.57 KB | Posted: 1/16/07
The old needle and seat is removed by freeing this screw and then turning the nut to unscrew the assembly.

qft24.JPG
4671 hits | 61.79 KB | Posted: 1/16/07
Hold the float bowls and metering blocks in position and start the four bolts by hand. New bolt seals are provided with the blocks. Be sure to get the accelerator pump arm on the right side of its actuator before you tighten the bowls, if you forget ...

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4646 hits | 58.56 KB | Posted: 1/16/07
Guide the gasket and metering block into place on the body before you install the float bowls. Be sure the locating pins are all securely seated in their holes before you try to tighten the bolts.

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Start each screw by hand then tighten gradually in a cross pattern to avoid distorting the diaphragm.

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The new diaphragm installs on top of the return spring.

qft01.jpg
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Affordable Holley four-barrel performance rebuild kits from Quick Fuel Technology

Story and photos by Joe Woods


The Holley 600cfm vacuum secondary four-barrel (PN 0-1850) offers a good balance of performance and fuel economy on most ...

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5121 hits | 44.02 KB | Posted: 1/16/07
Compared side-by-side, the original power valve can't begin to match the flow of QFT's Four Door power valve.

orison03.jpg
5036 hits | 48.91 KB | Posted: 1/16/07
It's important to completely submerge the rusty part in Evapo-Rust because anything left uncovered wont be treated.

qft32.JPG
5019 hits | 70.04 KB | Posted: 1/16/07
This screw allows adjustment of the vacuum secondary. If adjusted correctly, it will open smoothly without any surge or lag in power delivery.

Here is the finished product, from a useless paperweight to an affordable and totally adjustable performan...

qft25.JPG
4912 hits | 61.57 KB | Posted: 1/16/07
The old needle and seat is removed by freeing this screw and then turning the nut to unscrew the assembly.

orison01.jpg
4901 hits | 37.99 KB | Posted: 1/16/07
Targeted rust removal with Orison's Evapo-Rust

Rust is the nemesis of all classic cars. If left unchecked, it will spread like cancer and destroy precious and often irreplaceable parts. In the past, rust removal involved harsh abrasives or ...

qft26.JPG
4901 hits | 62.35 KB | Posted: 1/16/07
Install the new needle and seat assemblies by simply dropping them into the holes and pressing lightly with your finger to push the o-ring seals into place.

orison02.jpg
4818 hits | 46.71 KB | Posted: 1/16/07
All we did to prepare the choke for cleaning was spray it off with a degreaser to make sure the Evapo-Rust could get to every surface. We filled a small plastic tub with Evapo-Rust and dropped in the actuator.

qft02.jpg
4804 hits | 56.96 KB | Posted: 1/16/07
Start with a good carb cleaner, such as Justice Brothers, to remove built up gunk and dirt.