• Eliminates torsional crankshaft vibrations
• Exceeds SFI 18.1 specs
• Black zinc chromate finished
• Tunable, rebuildable, and extremely efficient at ALL RPM
• Laser engraved timing marks

Inner and outer shells are available in aluminum or steel, and contain a steel inertia weight. This inertia weight has six (2-ring design) or eight (3-ring design) computer machined grooves to retain the proper durometer O-rings (dyno tested for each application).

Damper Accessories
How to choose the correct style Ford Small Block Damper
How to read the Damper charts
Installation Instructions

2. Pulley Bolt Style
Ford pulleys come in two bolt styles - either 3-bolt or 4-bolt fronts. 3-bolt pulleys are found on dampers with a length of 3", 4-bolt pulleys are used on 4" dampers, and 3.35" (~3-3/8") dampers use both 3 and 4 bolt fronts. On ATI's damper charts, 3-bolt dampers are highlighted in Yellow and 4-bolt dampers are highlighted in Orange.

3. Damper Length
Ford dampers come in three lengths—the distance measured from the front face of the damper to the back of the hub. They are approximately 3”, 3.35" (~3-3/8") or 4”.

• 1982 and later 302 HO, 34 oz. in. use Damper #918910.
  
  
• External balance units are 28.2 oz.in. 302-351, except 302 HO part #918910 which is 50.oz.
  
  
• Part #918911 (28 oz. in.): If you install a 351 external balance crank in a 302 HO and use the stock 302 HO timing cover.
  
  
• The 28.2 oz. in. units will work on all external balance engines EXCEPT the 1982 and later HO provided the timing tab is in the proper place or you can fabricate a pointer. The length is okay if you’re using pulleys.

1. These dampers have a 2.280 female pulley locating diameter
2. Minor modifications to water pump may be needed to clear 7” dampers. Most electric water pumps have clearance.
3. 1957-1961 early FE - Requires adapter #916581 & shortening the spacer sleeve .375”, to install stock pulleys in the OEM location.
4. For use with aftermarket crank with key at front. Hub must be honed to fit. Hub has .150 counterbore for full length press fit.May not fit with Jesel belt drives. Call ati for info.
5. Ford 3 bolt dampers will accept pulleys with std Ford 3 bolt 3.3” diameter circle.
6. For early “A” timing tab, be sure to tell your Sales Tech that  A timing tab is needed with driver’s side timing marks.
   

7. Timing marks 0-60° in 1° increments.
8. This hub is bored straight through with no lead area & will not press fit onto OEM crankshafts with the keyway 1” back. It is intended for aftermarket cranks or “engine builder hone to fit” full length keys. Request counterbore if using an OEM crankshaft.
10. Add “G” to part # for aftermarket crank. This hub is bored straight through with no lead area and will not press fit onto OEM crankshafts with the keyway 1” back. It is intended for
    aftermarket cranks or “engine builder hone to fit” full length
    keys. Request counterbore if using an OEM crankshaft.
12. Add “U” to # for undersized specs.
15. Contact an ATI Sales Tech for correct part # when used with Ford 3-bolt pulleys!
19. Does not work with 2.0L Pinto.

2)  Washer #954078 is required and included.
3)  All hubs have 3/16 key @ std SB 10° location.
4)  Std GT500 will require an 88” belt with a stock diam. blower
     pulley. For 2013 models with oil cooler, relocation fittings are
     available from EVO Performance.
6)  An optional adapter ring and interchangeable blower drive
     pulleys are available from METCO Motorsports for this damper.
7)  These dampers will not work with a stock water pump pulley.      Requires Whipple pulley kit #WB-COY10-11 for 2011-2014 and
     WB-COY10-15 for 2015 to retain stock water pump or an
     electric pump must be used.

8)   Hub #916124K has two (2) 3/16” keyways.
9)   OEM replacement, can be used with a 6 rib belt to the rear.
10)  Has oversized hub and special seal (#973138).
11)  This damper does not fit the 2014 Cobra Jet
       without modifications to the rear of the shell.
12)  No timing marks.
13)  For an aluminum hub, add “A” to part number.
14) Install required Whipple Pulley Kit WB-COY10-11
      for 2011-2014 and WB-COY10-15 for 2015
15) Installation of damper may require modified oil pump pulley
16) 4% Overdriven over OEM

1. Locate the correct manufacturer's chart
2. Choose the specific engine application listed down the left side of the chart
3. Determine if the damper needs to be internally or externally balanced ( external balance dampers are constructed of steel only). Black bars that extend horizontally across the entire chart designate these sections
4. Determine if you need steel or aluminum shells. Labels for this information are listed across the top of the chart in columns 2 and 3.
5. Once you have determined the shell material, you need to find the outside diameter (OD) of the desired steel or aluminum shell. Then choose between 2 or 3 rings and the desired weight of the damper.
6. From the far right section of the chart, select either a steel or aluminum hub for your desired engine application. To determine the correct damper assembly part number that intersects is the correct damper assembly.
7. Assembly part numbers that are color coded correspond to the pulley mount bolt pattern listed near the top of the charts.