[DeTomaso] Holley throttle cable bracket

[Mike Drew]

All,

You find all sorts of stuff when cleaning up a garage. I’m just working on a piece of floor about 5x5 feet that had a pile of detritus going back decades. I can see floor now!

In a bag I found a pair of throttle cable brackets for a Pantera. The stock one is on the right, and a Holley double pumper bracket (Made years ago by Roger Sharp for Larry Stock, I believe) on the left:

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This bracket sits on the left forward top of the engine, secured by the forwardmost intake manifold bolt. 

As you can see, the aftermarket bracket spaces the end of the cable housing towards the front of the car about an inch. This is critical for proper functioning of Holley double-pumper carbs. The stock carb has vacuum secondaries, as do many popular Holley models. They need relatively little cable movement to open the primaries all the way, and engine vacuum then opens the secondaries. 

A double pumper relies on throttle cable movement top open both the primaries and secondaries. With the stock bracket, there is insufficient throw available.  More than a few Pantera owners have been zooming around for years without their secondaries ever having opened!

There is more than one way to skin this particular cat. Dennis Quella sells a bracket which bolts to the Holley throttle linkage:

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Instead of moving the cable housing towards the front, he keeps it in the stock location and moves the pickup point on the carburetor aft.  The ball on the carb that engages the end of the cable is about an inch aft of where it would normally be.

If you have mechanical secondaries, and don’t have one of these two devices, chances are you are losing about 50% of your horsepower! It’s a good idea to pull the air cleaner lid, and with the engine off, peer into the top of the carb (use a mirror) while somebody sits in the driver’s seat and floors the pedal. If the secondaries don’t open all the way, and you can’t adjust the cable to solve the problem, one of these two gidgets is what you need!

Mike

Sent from my iPad