Description
Stackable shims index spark plugs at 30ˇ intervals up to 360ˇ, 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 60ˇ, 12 black 90ˇ, detailed instructions and dial chart.
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