Spark Plug Index Shims - Installation Instructions:
(Shims are intended for 14mm at seat spark plugs only)
• Inspect all spark plugs for any damage such as cracked/broken porcelain.
• Gap each spark plug to desired specications.
• Compress factory washer to a minimum of 30 ft. lbs. of torque. Be careful not to compress further once
shims have been added and spark plug is installed in cylinder head. An indexing nut or a steel block with
proper threads works well for this saving wear and tear on cylinder head threads.
• Mark ground location on surface of white porcelain with a black marker.
• Thread spark plug into cylinder head, tighten to manufacturer’s specs. If manufacturer’s specs are
unknown, 20 ft. lbs. of torque is recommended.
• Line up the arrow on dial chart in same direction as the spark plug ground mark to determine shims
needed to position the ground at desired angle.
• Thread required shims onto spark plug and install.
• Tighten spark plug to same manufacturer’s specs determined in above step.
Shims 60° (Silver) / 90 ° (Black)
Line up dial chart arrow at
same angle as mark on spark plug.
Look for desired angle and
determine shims needed from chart.
Silver
Shims 60
°
Black
Shims 90
°
Allstar Performance 8300 Lane Dr., Watervliet, MI 49098
P:(269)463-8000 F:(800)772-2618 www.allstarperformance.com
Form 1128 Page 1 of 1 Rev. 040313
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