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Your cart is empty.Stackable shims index spark plugs at 30° intervals up to 360° properly positioning ground strap in cylinder head for increased power and clearance between spark plug and piston. Shims are intended for use with 14mm flat seat spark plugs only. Package of 24 shims contains 12 silver 60°, 12 black 90°, detailed instructions and dial chart.
Debra Jones
Reviewed in the United States on July 23, 2023
I used these on my boat motor that requires the plugs to be perfectly indexed. Between the 2 thicknesses I was a ble to use just one spacer. 3 out of 6 plugs required washers. I wished that I knew about these a few years ago.
Customer
Reviewed in the United States on February 3, 2021
Thin steel indexing washers. Two thickness sizes (.2mm & .3mm); these correspond to rotating the the plug 10min. or 15min. counter clockwise for each size that you would use. (on a 12hr regular clock face). Tighten spark plug to 20-30 lb. ft. torque to flatten stock crush washer to a nice flat shape; then add indexing washers to rotate back counter clockwise till you are where you want to index to. (I've been indexing plugs since I was 24years old, and this has been my easiest way to do it for those past 49 years.)
Russell J.
Reviewed in the United States on February 23, 2021
For a 14mm sparkplug, hole is not 14mm.Buyer beware
Ron H
Reviewed in the United States on December 24, 2019
This index washers are ready thin, silver is .008, black is .012. I have had the other brands and their thins washer was the copper at .048. You can adjust the index anywhere with this and they don't pull the spark plug out of the cylinder, like the thick washers. I was really happy how easy this worked.
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