Sounds like you have a stretched main chain, or maybe two. These drive the cams from the IMS and are known to stretch.
We have master linked chains and can change these chains without full engine disassembly.
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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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