K&N Air Filters for Injector Stacks

Individual Round Style(Sold individually unless specified otherwise)

 

“Early Type” Fuel Injectors (Single Stacks) for Chevrolet, Etc.

 
Filters designed to fit with cut velocity stacks, or straight pieces of exhaust tubing. Rubber filter bases come with molded in velocity stack type radius and step, for smooth bore down from element to tube. Each filter has a rubber top with a stamped K&N logo.

 

  Air Filter        Injector          Air Filter           Part #            Part #
Mounting Flange    Bore Size       Diameter x Length   Straight Neck      5? Angle Neck
Inside Diameter  Inside Diameter      In Inches       Mounting Flange    Mounting Flange
1-7/8" (47.5mm)  1-13/16" (46mm)   3-1/2 x 4          RD-0450            N/A            
                                   3-1/2 x 5          RD-0460            N/A            
                                   3-1/2 x 6          RD-0470            N/A            
2-1/8" (54mm)    2-1/16" (52.5mm)  3-1/2 x 4          RD-0500            RB-0500        
                                   3-1/2x 5           RD-0510            RB-0510        
                                   3-1/2 x 6          RD-0520            RB-0520        
2-1/4" (57mm)    2-3/16" (55.5mm)  3-1/2 x 4          RD-0600            RB-0600        
                                   3-1/2 x 5          RD-0610            RB-0610        
                                   3-1/2 x 6          RD-0620            RB-0620        
2-1/2" (63.5mm)  2-7/16 (62mm)     3-1/2 x 4          RD-0700            RB-0700        
                                   3-1/2 x 5          RD-0710            RB-0710        
                                   3-1/2x 6           RD-0720            RB-0720        
2-5/8" (66.5mm)  2-9/16" (65mm)    4 x 4              N/A                RB-0800        
                                   4 x 5              N/A                RB-0810        
3" (76mm)        2-15/16" (74.5mm) 4-1/2 x 4          N/A                RB-0900        
                                   4-1/2 x 5          N/A                RB-0910        

 

Kinsler Non-Siamesed Fuel Injector Stacks

 

Round filters fit uncut ram tube bells and clamp securely to the lip. Will fit any injection setup that has a minimum of 4-1/4" center to center, and parallel ram tubes. Each filter has a rubber top with a stamped K&N logo.

 

Ram Tube  Filter Size      Injector Model #  Part # Single  
3-7/8"    4-1/4"B,4"T,6"H  N/A               RD-6000        
3-5/8"                     “351-F-8”         RD-6010        
3-7/8"                     N/A               RD-6020        

 

Hilborn 4, Injectors Fitted to Honda and Kawasaki Engines in T.Q. Midgets

 

Air filters designed to fit over stock, uncut ram tubes. Filters come complete with rubber mounting adapters. To install, fit rubber adapters around ram tube bases and fit filters over ram tubes and clamp onto adapters in desired position. Air filters come with chrome end caps. Fits #45-K-4A and #45-H-4B Hilborn injectors and are packaged in sets of four.


RD-1004

 

Filters measure 3" O.D. x 6"L and fit 1-1/2" Ram Tubes. Set of four   RD-1004 

 

Hilborn Injectors for Blowers and Turbos

 

Air filters designed to fit over stock, uncut ram tube. Filter comes complete with rubber mounting adapter. To install, fit rubber adapter around ram tube base. On early screw-on ram tube type, cut adapter with razor blade and wrap around tube. Fit filter over ram tube and clamp onto adapter in desired position. Air filters come with chrome end caps.

 

Hilborn Injector #525, for Magnuson Super Chargers. Used on Harley Davidson and 
V.W. blown engines. Filter fits 2-1/8" ram tube. Measures 6" dia. top, 5-1/2" dia. base, 6" long 
                                                                               RD-1100 
Hilborn Injector #523, for 60 c.i. Magnuson Blower Head. Filter fits 2-1/2" ram tube. 
Measures 7" dia. top, 7" dia. base, 6" long 
                                                                               RD-1200 
Hilborn Injector #524, for 80 c.i. Magnuson Blower Head. Filter fits 3" ram tube. 
Measures 7" dia., 6" long. 
                                                                               RD-1300 
Hilborn Injector #F414A, for Turbocharged tractor, air filter clamps over 4" lip on
cast ram tube. Air filter measures 7" dia., 6" long 
 Rubber mounting adapter not required. Filter mounts directly to injector      RD-1400 
Hilborn Injector #F414A, for Turbocharged tractor, air filter clamps over 4" lip on
cast ram tube. Air filter measures 7" dia., 8" long
 Rubber mounting adapter not required. Filter mounts directly to injector      RD-1410 
 

Dual Oval Style

 

“Late Type” Hilborn Siamese Stacks 

 
Filters are designed to be used with stock, uncut, siamesed ram tubes. Comes with removable aluminum top plate. To install, push Ram Tubes through rubber base and clamp at desired height. Oval top plate measures 9"L x 5-1/2"W, total height is 6-3/4".  


RD-4600

 

                                      Injector     Center to Center 
Injector Tube         Injector         Model          Measurement      
Outside Diameter   Inside Diameter     Number          of bores         Part #  
2-1/8" (54mm)      2-1/16" (52.5mm)     “R”             2.44"         RD-4200
2-1/4" (57mm)      2-3/16" (55.5mm)     “Q”             2.44"         RD-4400
2-1/2" (63.5mm)    2-7/16" (62mm)       “P”             2.70"         RD-4600 *
2-5/8" (66.5mm)    2-1/2" (63.5mm)   “327-C-84”         2.70"         RD-4650
2-3/4" (70mm)      2-5/8" (66.5mm)   “327-C-8”          2.87"         RD-4669 **
3" (76mm)          2-15/16" (74.5mm)    “F”             3.20"         RD-4800
3-1/8" (79.4mm)    3" (76mm)         “396-C-8M”         3.20"         RD-4850

* Adapter kit needed to convert the air cleaner when equipped with 2-1/4" restrictor stacks is # 85-4600, and kit includes 8 adapters. 
** Packaged four per box. When ordering singles specify #RD-4660 right side or #RD-4670 left side.

 

Kinsler- Siamese Stacks 

 
These air filters are designed for use with the Kinsler fuel injection system for Pontiac and Chevrolet small block V8.  Air filters come with removable top plate, to install, push injector tubes through rubber base and clamp at desired height.  Oval top plate is 9"L x 5-1/2"W.  Total height of air filter is 6-3/4".


RD-5020

 

                                      Injector     Center to Center 
Injector Tube         Injector         Model          Measurement      
Outside Diameter   Inside Diameter     Number          of bores        Part #  
2-5/16" (58mm)     2-3/16" (55.5mm)     N/A              2.80"         RD-5000
2-3/8" (60mm)      2-1/4" (57mm)        N/A              2.80"         RD-5000
2-9/16" (65mm)     2-7/16" (62mm)       N/A              2.80"         RD-5010
2-5/8" (66.5mm)    2-1/2" (63.5mm)      N/A              2.80"         RD-5020

 

“Late Type” Hilborn and Other Injectors for V.W. Air-cooled Engines

 
Air filters designed to fit over stock, uncut ram tubes. Comes with removable aluminum top plate. To install, push ram tubes through rubber base and clamp at desired height. Oval top plate measures 9"L x 5-1/2"W, total height is 6-3/4". 


RD-3400

 

 Air Cleaner          Injector      Hilborn         Center to Center 
Mounting Flange      Bore Size       Model             Measurement      
Inside Diameter   Inside Diameter   Number              of bores       Part #   
1-3/4" (44.5mm)   1-11/16" (43mm)   #1600 V-4           3.312"         RD-3400
1-7/8" (48mm)     1-13/16" (46mm)   31600 V-4B          3.312"         RD-3500
2-1/8" (54mm)     2-1/16" (52.5mm)  #2000 V-4           3.375"         RD-3600
1-3/4" (44.5mm)   1-11/16" (43mm)   ARPM Rotary F/I     2.700"         RD-4900

 

“Early Type” Hilborn and Other Injectors for V.W. Air-cooled Engines

 
Air filters designed to fit over stock, uncut ram tubes. Fits early type tubes with right angle mounting flange, held on with four screws. Cleaners come complete with rubber mounting adapters. To install, cut adapter with a razor blade and wrap around ram tube. Drop one-piece filter over ram tubes and clamp onto adapters in desired position. Oval top plate measures 
 


RD-3200

 

 Air Cleaner          Injector      Hilborn         Center to Center 
Mounting Flange      Bore Size       Model             Measurement      
Inside Diameter   Inside Diameter   Number              of bores       Part #   
1-3/4" (44.5mm)   1-11/16" (43mm)   (Early)1600 V-4       3.312"       RD-3200


These filters are legal ONLY for racing vehicles.  Not applicable, nor intended for use on emission controlled street or highway vehicles.