K&N 85-0500 Stubstack For Holley Square Bore With Milled Choke Horn
Retail Price: $47.99
Sale Price:
$35.14
Installation
The K&N Stubstack is designed to increase the airflow of carburetors, by decreasing the restriction around the choke horn. The stubstack fits inside the air cleaner housing and slides snugly down over the choke horn. Install holding nut finger tight and use Loctite or 3M to seal. When installed on some models, there may be a slight gap at the base, however this is normal and will not affect the performance of the stubstack. Due to space limitations between the choke horn and some air cleaner baseplates, the stubstack has two thin spots in the casting. These will sometimes crack or chip slightly, but does not affect the performance. Because carburetor castings vary, the stubstack will not fit all carburetors. Check the list numbers for proper application. On some carburetors that are listed, it may be necessary to alter certain areas on the stubstack. The polyurethane material is easily filed and sanded.
Smog Legal
50 State Smog Legal
Tech Notes
This stubstack is designed to be used with Holley 390 - 850 CFM square bore carbs (4150/4160), that have had the choke horn milled off, but do not use an air cleaner. The full radius design helps to increase the airflow for drag racing. Will also hold down the base plate of a cold air scoop. Will not work with K&N custom chrome racing air cleaners.
Description
The K&N Stubstack reduces turbulence and improves metering accuracy. It increases the airflow by reducing restriction, straightens and speeds up air-flow. The stubstack is designed to onlywork effectively with K&N Filtercharger elements and 360 degree custom air cleaner assemblies. If the stubstack is installed in an improper housing, the performance may actually drop! The minimum height above the stack needs to be at least 1 1/2inches for proper operation. Check the K&N Custom Assemblies that will work properly.
Manufacturer Information
Item: STUBSTACK-HOLLEY MILLED CHOK
Item Number: 85-0500
Approximate Item Package Dimensions: 7" x 7" x 2"
Approximate Item Package Weight: 1 lbs
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