K&N 85-0500 | Carburetor Mount

Part Number
Stubstack Air Horn
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This K&N Stubstack is designed to be used on 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. The K&N Stubstack is designed to increase the airflow of carburetors by decreasing the restriction around the choke horn. Stubstacks fit inside the air cleaner housing and slide snugly down over the choke horn.



  • For Use Without An Air Cleaner
  • Improves Metering Accuracy
  • Increases The Airflow by Reducing Restriction
  • Reduces Turbulence
  • Stubstack Air Horn
  • This K/N Stubstack air filter is designed to be used on Holley 390-850 cfm square bore carbs (4150/4160); that have had the choke horn milled off; but do not use an air cleaner.
  • Will Hold Down A Cold Air Scoop


Item Height0.563 in. (14mm)
Item Weight0.300 lbs. (0.1 kg)
Length6.540 in. (166mm)
Package Content1
Package MaterialPaperboard
Package Quantity1
Package TypeBox
Product Box Height2.000 in. (51mm)
Product Box Length6.500 in. (165mm)
Product Box Width6.500 in. (165mm)
Prop 65 (C, R or CR)CR
Prop 65 Warning Labelhttps://www.knfilters.com/images/l/prop65.jpg
TitleK&N 85-0500 Stubstack Air Horn
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Width6.540 in. (166mm)


Customer Questions
Can K&N filters get wet?
No, K&N filters should not get wet.
When to clean K&N air filter?
K&N air filters should be cleaned approximately every 50,000 miles (80,000 kilometers) or as recommended by the manufacturer.
Will K&N filter increase mpg?
It is possible for a K&N air filter to slightly improve fuel efficiency (MPG) under certain conditions.
What does K&N mean?
K&N stands for the names of the two founders of the company, Ken Johnson and Norm McDonald.
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