When the 9a1 engine was introduced, the mag drain plugs needed to be altered to fit all engines. This is when the plugs became a tad longer, and tapered.
Torque to no more than 19#
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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