K&N Stubstack^®

The K&N Stubstack reduces turbulence, improves metering accuracy. Increases the airflow by reducing restriction. Straightens and speeds up air-flow.

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.

AIR FILTER APPLICATION:
The stubstack is designed to only work effectively with K&N Filtercharger™ elements and 360™ 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 1-1/2" for proper operation. See bottom of webpage for compatible K&N custom assemblies.

FLOW BENCH TEST RESULTS As Tested By Hot Rod Magazine MODEL CARB. INCREASE 650 CFM 28 CFM 850 CFM DYNO TEST: 5,000 RPM STOCK PAPER ELEMENT: 295.4 H.P. WITH K&N STUBSTACK/FILTER: 304.6 H.P. "The original STUBSTACK™ hi-performance air horn will increase your engine's air flow up to 40 cfm with this simple bolt-on." Hot Rod Magazine

---

Holley 2300 Series Stubstack 85-0210

HOLLEY 2300

Fits most Holley 2300 Series carburetors. The Stubstack is designed to fit 2 barrel popular models within this series. Holley carburetor list numbers are stamped on the choke horn.

Carburetor	Model	CFM
0-4412	2300	500
0-6425	2300	650
0-7448	2300	350

---

HOLLEY Square Bore with Milled Choke Horn Stubstack 85-0500

HOLLEY Square Bore with Milled Choke Horn

This stubstack is designed to be used on Holley 390-850cfm 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.

---

HOLLEY Square Bore with Milled Choke Horn Stubstack 85-0400

HOLLEY Square Bore with Milled Choke Horn

This stubstack is designed to be used with Holley 390-850cfm square bore carbs (4150/4160), that have had the choke horn milled off and still use an air cleaner. Eliminates the need for hand polishing and radius work. Will work with all K&N Custom Chrome Racing Air Cleaners, including Tall Velocity Stack Air Cleaners.

---

Holley 1050 & 1150cfm Dominator Stubstack 85-0600

HOLLEY Dominator

This stubstack is designed to be used on Holley 1050 & 1150cfm Dominator carbs. Will not allow use of a standard air cleaner housing, but it will hold down the base plate of a cold air scoop. Straightens airflow and helps even out the flow to all four venturies. Decreases the restriction around the throttle bores.

---

HOLLEY 4150 & 4160 Stubstack 85-0200

HOLLEY 4150/4160

Fits most Holley 4150 and some 4160 Series carburetors with high and low choke horns. The 85-0200 is designed to fit 4 barrel popular models in this series. Holley carburetor list numbers are stamped on the choke horn. See the below chart for complete carburetor list numbers.

Carburetor	Model	CFM		Carburetor	Model	CFM		Carburetor	Model	CFM
0-1848-1	4160	465		0-4779-1 **	4150	750		0-7410	4150	340
0-1849	4160	550		0-4779-2 **	4150	750		0-7411	4150	370
0-1850	4160	600		0-4779-5 **	4150	750		0-7448	2300	350
0-1850-1	4160	600		0-4780 **	4150	800		0-7985	4160	600
0-1850-2	4160	600		0-4780-1 **	4150	800		0-7986	4160	600
0-1850-3	4160	600		0-4780-2 **	4150	800		0-7987	4160	600
0-1850-4	4160	600		0-4780-3 **	4150	800		0-8004	4160	600
0-2818	4150	600		0-4781 **	4150	850		0-8005	4160	600
0-2818-1	4150	600		0-4781-1 **	4150	850		0-8006	4160	600
0-3310 *	4150	780		0-4781-2 **	4150	850		0-8007	4160	390
0-3310-1 *	4150	780		0-4788 **	4150	830		0-8156 **	4150	750
0-3310-2 *	4160	750		0-4788-1 **	4150	830		0-162 *	4150	850
0-4118 *	4150	725		0-6109	4150	750		0-8181	4160	600
0-4452-1	4160	600		0-6299	4150	390		0-8804 **	4150	830
0-4452-2	4160	600		0-6299-1	4160	390		0-9002	4182	600
0-4548	4160	450		0-6619	4160	600		0-9040	4160	600
0-4776 **	4150	600		0-6619-1	4160	600		0-9210	4160	600
0-4776-1 **	4150	600		0-6895	4150	390		0-9219	4160	600
0-4776-2 **	4150	600		0-6909	4160	600		0-9254	4160	600
0-4777 **	4150	650		0-6919	4150	800		0-9379 **	4150	750
0-4777-1 **	4150	650		0-6979	4160	600		0-9380 **	4150	850
0-4777-2 **	4150	650		0-6979-1	4160	600		0-9381 **	4150	830
0-4778 **	4150	700		0-6989	4160	600		0-9626	4160	600
0-4778-1 **	4150	700		0-7009	4160	600		* Indicates dual feed fuel bowls ** Indicates dual accel. pump & dual feed bowls
0-4778-2 **	4150	700		0-7009-1	4160	600
0-4779 **	4150	750		0-7154	4160	600

---

Edelbrock Square-Bore Carburetor Stubstack 85-0700

EDELBROCK Square-Bore Carburetors

Fits Edelbrock Square-Bore carburetors. The Stubstack is designed to fit almost every model within this series. This Stubstack straightens and speeds up airflow, reduces turbulence, improves metering accuracy and increases airflow by reducing restriction. Available for the Edelbrock part numbers. Will also fit some Carter AFB models.

Model	CFM	Choke
1400	600 cfm	electric choke
1404	500 cfm	manual choke
1405	600 cfm	manual choke
1406	600 cfm	electric choke
1407	750 cfm	manual choke
1411	750 cfm	electric choke

K&N Custom Chrome Assemblies by part that are compatible with Stubstacks 85-0200, 85-0210 and 85-0700 ONLY!

K&N Assembly	Diameter	Total Height
60-1180 (w/vent)	11" O.D.	4 1/2"
60-1190	11" O.D.	6"
60-1200 (w/vent)	11" O.D.	6"
60-1210 (w/vent)	11" O.D.	7"
60-1220	11" O.D.	7"
60-1260	14" O.D.	5 5/8"
60-1270	14" O.D.	6 5/8"
60-1300	14" O.D.	4 3/4"
60-1310	14" O.D.	5 3/4"

---

Note: Legal in California only for racing vehicles which may never be used, registered, or licensed for use upon a highway. See knfilters.com for CARB status on each part for a specific vehicle.