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Old 03-29-2009, 07:34 PM
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Holly jet extenders

I use a 4412 Holly on my stock car, run on a dirt track and the rules in my class require me to use this carb. I am a good carb guy but haven't done any modifying was wondering if jet extensions would do any thing for me or are they more for drag racing. i am just looking to get all I can out of this that I can.Thanks to all in advance.

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Old 03-29-2009, 07:46 PM
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If you've got a hot streeter or drag car that launches hard, fuel will slosh to the rear of the secondary bowl and away from the main jets under acceleration. By installing jet extensions, it will often keep the fuel in contact with the jets. They claim a street car can gain 0.20 second with just the addition of jet extensions. I'm not sure if they are recommended on dirt surface or not. Several friend install them on their cars because they are cheap enought to purchase. I've used them before and personally did not see any difference on hard acceleration or normal driving. You'll also need to purchase a special notched float on Holley's for clearance issues with the floats from the extensions.

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Old 03-29-2009, 07:58 PM
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not unless you are running your two barrel backwards on the manifold. Jet extensions are for the rear fuel bowl of typical Holley 4-barrels.
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Old 03-29-2009, 08:14 PM
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Well that makes sense, I just had never talked to any one that used them thank's for the input.
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